At one time, Chondrichthyes were thought to have diverged from other vertebrates before the evolution of bone. Now we have concluded that the Chondrichthyes diverged after the evolution of bone had started. What does this change demonstrate about the evolution of fishes
Answer:
The correct answer would be - Characteristics can be lost in evolution.
Explanation:
The new evidence helps in developing a new hypothesis. In this case, new evidence proved that the Chondrichthyes diverged after the evolution of bone had started instead of before the evolution started. This process called atavism where an ancestral genetic trait reappears after having lost. This leads to loss of the traits in the evolution
This can take place by knocking the mutation out to overriding the gene by the old gene or overriding the new trait by the old trait during the evolution period.
At one time, Chondrichthyes were thought to have diverged from other vertebrates before the evolution of bone. Now we have concluded that the Chondrichthyes diverged after the evolution of bone had started might be their characteristics lost in evolution according to atavism.
What is atavism?
Recurrence in an organism of a trait or character typical of an ancestral form and usually due to genetic recombination. This leads to the loss of the traits in the evolution.
Hence, Chondrichthyes diverged after the evolution of bone had started might be their characteristics lost in evolution according to atavism.
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n rabbits, coat color is affected by a series of alleles with a hierarchy of dominance such that C >Cch>Ch>C. Each allele is dominant over all the alleles listed to its right. C codes for full color, Cch codes for chinchilla, Ch codes for himalayan (white with black extremities) and C codes for albino. A chinchilla rabbit is mated to a himalayan rabbit. Each of these rabbits had one albino parent. What are the phenotypes of the offspring and in what frequencies will they be produced
What does it mean to be impartial?
O A. To be unbiased
OB. To be strong
O c. To be useful
D. To be smart
Answer:
i think A
Explanation:
Austin made the claim that meiosis provides an advantage for sexually reproducing organisms by ensuring genetic variation
Which statement explains why he is correct
A. Meiosis allows the offspring produced during sexual reproduction to grow and develop
B meiosis joins together the sex cell during sexual reproduction to produce new offspring
C meiosis produces sex cells that are joined during sexual reproduction to produce offspring
D meiosis produces the body cells that join to form new offspring during sexual reproduction
Answer: C. meiosis produces sex cells that are joined during sexual reproduction to produce offspring
Explanation:
Meiosis is also called as reduction division in this the parent diploid cell divides twice to produce four haploid daughter cells. The daughter cells so produce after cell division contain half the number of chromosomes then that of the parent cells. The germ cells in males and females divide twice or meiotic division occurs in them twice to produce four daughter haploid gamete cells that are sperms (male) and ovum (oocyte) (female). These male and female gametes fuse during sexual reproduction. The sperm fertilizes an ovum to produce zygote.
Answer:
c
Explanation:
What is a density dependent limiting factor that affects population size?
-Drought
-Climate
-Natural Disasters
-Disease
Answer:
Disease
Explanation:
In Ecology, certain factors that affect the size of a population can either be dependent on size or not. Density-dependent factors are those factors that affect population of organisms in dependence of how dense the population is. Examples of these density dependent factors are diseases, predation etc.
For example, a certain disease will spread faster among a population of organisms whose size is dense but slower in a scarcely densed population. Hence, disease as a factor is dependent on population size. Note that; Drought, Climate, and Natural Disasters will wipe out a population irrespective of its size.
Answer:
Disease
Explanation:
When light passes into a more dense material, it bends away from the normal
True or false
Answer : Flase
(つ ^_^ )つ Hey There!
Answer : False, When light passes from a more dense to a less dense substance, (for example passing from water into air), the light is refracted (or bent) away from the normal.
~Hope this Helps!~
an organisms habitat must provide all of the following except
Answer: Predators (trust me)
Answer:
except what? there are no possible answer
Explanation: Please give possible answers
choose five body systems that are involved in maintaining homeostasis in your body as you answer these assessment questions. Explain how these five body systems work together.
Answer:
Explanation:
Water Levels
For example, the cardiovascular, urinary, and lymphatic systems all help the body control water balance. The cardiovascular and lymphatic systems transport fluids throughout the body and help sense both solute and water levels and regulate pressure. If the water level gets too high, the urinary system produces more dilute urine (urine with a higher water content) to help eliminate the excess water. If the water level gets too low, more concentrated urine is produced so that water is conserved.
Internal Temperatures
Similarly, the cardiovascular, integumentary (skin and associated structures), respiratory, and muscular systems work together to help the body maintain a stable internal temperature. If body temperature rises, blood vessels in the skin dilate, allowing more blood to flow near the skin’s surface. This allows heat to dissipate through the skin and into the surrounding air. The skin may also produce sweat if the body gets too hot; when the sweat evaporates, it helps to cool the body. Rapid breathing can also help the body eliminate excess heat. Together, these responses to increased body temperature explain why you sweat, pant, and become red in the face when you exercise hard. (Heavy breathing during exercise is also one way the body gets more oxygen to your muscles, and gets rid of the extra carbon dioxide produced by the muscles.)
Conversely, if your body is too cold, blood vessels in the skin contract, and blood flow to the extremities (arms and legs) slows. Muscles contract and relax rapidly, which generates heat to keep you warm. The hair on your skin rises, trapping more air, which is a good insulator, near your skin. These responses to decreased body temperature explain why you shiver, get “goose bumps,” and have cold, pale extremities when you are cold.
Homeostasis of Ions
Body functions such as regulation of the heartbeat, contraction of muscles, activation of enzymes, and cellular communication require tightly regulated calcium levels. Normally, we get a lot of calcium from our diet. The small intestine absorbs calcium from digested food.
The endocrine system is the control center for regulating blood calcium homeostasis. The parathyroid and thyroid glands contain receptors that respond to levels of calcium in the blood. In this feedback system, blood calcium level is the variable, because it changes in response to the environment. Changes in blood calcium level have the following effects:
When blood calcium is low, the parathyroid gland secretes parathyroid hormone. This hormone causes effector organs (the kidneys and bones) to respond to increase calcium levels. The kidneys prevent calcium from being excreted in the urine. Osteoclasts in bones reabsorb bone tissue and release calcium.
When blood calcium levels are high, the thyroid gland releases calcitonin. Calcitonin causes the kidneys to reabsorb less calcium from the filtrate, allowing excess calcium to be removed from the body in urine. Calcitonin also suppresses the formation of active vitamin D in the kidneys; without vitamin D the small intestines don’t absorb as much dietary calcium. Osteoblasts, stimulated by calcitonin, use calcium in the blood to add to bone tissue.
Which of the following does NOT affects the type of severe weather a location gets? *
latitude
normal weather patterns
high pressure
geography
Answer:
high pressure
I think it is option C
hope it helps
Similarities between tridax plant and elephant grass
Answer:
ok so basically they just
5. DQ 5 Which of the following is NOT a class of clastic rock?
A.fossil
B.conglomerate
C.sandstone
D.shale
Answer:
B.conglomerate us not a class of clastic rock
In horses, a black coat is dominant over a brown coat. Both parents are heterozygous.
What is the probability that their offspring will have a BLACK coat?
What is the probability that their offspring will have a BROWN coat?
The genetic material of a bacterial cell is:
None of the above
DNA is present in chromosomes
Double stranded circular DNA
A single stranded DNA molecule
Answer:
DNA is present in chromosomes
PLEASE I NEED HELP ASAP :(
Answer:
b
Explanation:
the rest just wont help when you are trying to identify them
The radial tuberosity is the site of the attachment for the deltold muscle. True or false?
Answer:(Radius is bone on right. Radial tuberosity is visible at upper left of radius.) Details. Identifiers. Latin, Tuberositas radii. TA98 · A02.4.05.007 · TA2 · 1216 · FMA · 23489 · Anatomical terms of bone. [edit on Wikidata]. Beneath the neck of the radius, on the medial side, is an eminence, the radial tuberosity; ... Ligaments that support the elbow joint also attach to the radial ...
True
Explanation:
Hurry Timed!!! Help pls!!! 20 points!!!
Answer:
This fern has roughly 630 pairs of chromosomes or 1260 chromosomes per cell. The fact that these cells can accurately segregate these enormous numbers of chromosomes during mitosis is truly remarkable.
Explanation:
Leaf cell has 21 chromosomes.
please help asap and I’ll give brainiest!
Answer:
I think so A is the answer
Explanation:
changes in Geology over Time ... relative age – a rock layer's age compared to other rock layers ... Fossils give clues on how Earth may ... weather. ▫This helps us to infer that West. Virginia and Pennsylvania were both ... in the area. ... Many fish. Silurian 438 to 408 mya. First insects, vascular plants on land.
i hope my answer is correct and would help a little bit.
can someone help???? Question: In what domain would humans be included?
A Eukarya
B Archea
C Bacteria
Answer:
A Eukarya
Explanation:
Answer:
A Eukarya
explanation: Eukaryotes are organisms whose cells have a nucleus enclosed within a nuclear envelope
Which elements are likely to have similar properties to calcium because they have the same number of valence electrons as calcium
Answer:
The correct answer would be - strontium, magnesium, beryllium.
Explanation:
As we know that the number of the same valence electrons is most likely to exhibit similar physical and chemical properties so the elements of the particular group in the periodic table have a similar number of physical and chemical properties and a similar number of the valence electrons.
For example, group 2 elements are known as alkaline earth metals, and strontium, magnesium, beryllium, and calcium are the same group elements thus, they have the same chemical and physical properties as they have 2 valence electrons.
The smooth endoplasmic reticulum Group of answer choices converts sunlight into chemical energy. stores water, nutrients, and enzymes. is the site where lipids destined for other cellular compartments are manufactured. produces the energy needed to run chemical reactions in the cell.
Answer:
is the site where lipids destined for other cellular compartments are manufactured.
Explanation:
This is because smooth endoplasmic recticulum is an organelles found in eukaryotic organisms that lack membrane bound ribosomes and are found in cells that has much lipids like ovaries, testes, oil glands in the skin e.t.c. They are important in the synthesis of lipids is the site where lipids , Phospholipids, steroid hormones.
They also play a major role in detoxification of harmful metabolic by products and metabolic processes of calcium ions within the cell
How does the environment influence populations of organisms over multiple
generations?
Answer: Species can change over time in response to changes in environmental conditions through adaptation by natural selection acting over generations. ... Evolution results primarily from genetic variation of individuals in a species, competition for resources, and proliferation of organisms better able to survive and reproduce.
Explanation:
The function of the hepatic portal circulation is to ________. The function of the hepatic portal circulation is to ________. return glucose to the general circulation when blood sugar is low carry toxins to the kidney for disposal through the urinary tract distribute hormones throughout the body collect absorbed nutrients for metabolic processing in the liver
Answer:
The correct answer is ''collect absorbed nutrients for metabolic processing in the liver.''
Explanation:
Portal circulation is called that system that is between two large capillary beds, represented by the gastrointestinal organs, pancreas and spleen on the one hand, and the liver on the other. Hence, any venous system of the organism that is located between two capillary territories is called "portal system".The hepatic portal vein collects the deoxygenated blood from the gastrointestinal system, spleen and pancreas, this blood is venous and comes deoxygenated, in addition to being loaded with the nutrients absorbed in the digestive process, so it is a blood subjected to a high overload, but that quickly, thanks to its distribution through the liver, it will be bypassed to various chemical processes to extract a large part of the nutrients from it, and purify and eliminate toxins.
The function of the hepatic portal circulation is to collect absorbed nutrients for metabolic processing in the liver. Therefore, option D is correct.
The hepatic portal system is also known as the hepatic portal circulation or portal venous system. It is a specialized network of blood vessels that carries blood from the gastrointestinal tract, spleen, and pancreas to the liver. It plays a crucial role in directing nutrient-rich blood from the digestive organs to the liver for processing, storage, and detoxification before it is distributed throughout the rest of the body.
The hepatic portal system allows the liver to regulate the composition of blood coming from the digestive organs before it enters general circulation. Thus, option D is correct.
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I need help with this
Answer:
It is b. thermal
Explanation:
Which of the following correctly describes a nucleus?
All cells have a nucleus
The nucleus is where mitosis occurs
The nucleus gives the cell energy
The nucleus is where plants make their own food
The nucleus is where mitosis occurs.
Answer: B. The nucleus is where mitosis occurs
Explanation: B. The nucleus is where mitosis occurs
HELP ME PLEASE SOMEONE :(
Answer:
D
Explanation:
The other person is right, pls give them brainliest pls?
The image below is an example of which level of organization,
Which form of water is not considered as a resource? A) groundwater B) glacial ice C) ocean water D) water vapor E) surface water
Answer:
D. water vapor
Explanation:
water vapor is a gas and could not be used as a resource
All of these ___ help to block, trap or flush pathogens out of the body.
What are the following 6-
A-e???
Answer:
natural barriers
Explanation:
skin, mucous membrane, tears, earwax, muscus, stomach acid
Paleoclimatic analysis has generated a claim that there is a possible correlation between an extinction event around 29 million years ago that allowed grasslands to become abundant and the adaptive radiation of several groups of butterflies.
Which of the following proposes the best alternative hypothesis for the claim?
A- Climate analysis conducted by sampling pollen preserved in amber shows an increase in grass pollen 29 million years ago, but there is no significant difference between speciation rate, as well as species richness with regard to butterflies, before and after 29 million years ago.
B- Climate analysis conducted by sampling pollen preserved in amber shows an increase in grass pollen 29 million years ago, which indicates there was an increase in grasslands that correlates to an increase in butterfly speciation during the same time period.
C- There is a correlation between the rapid and wide-ranging decrease in species richness of insects in general 29 million years ago and the increase in species richness and diversity among the butterfly population during the same time period.
D- Evidence of rapid speciation among butterfly species 29 million years ago is evenly distributed among all environments of that period.
3. How do nutrients and other materials move in fungi?
Answer:
Nutrients and other materials from the environment are absorbed through mycelia. The branching mycelia have a high surface-area-to-volume ratio which allows the absorption of nutrients to be more efficient. Fungi may even digest nutrients by releasing enzymes into the environment.
Explanation:
I have a strange feeling that this isn't the answer you were looking for.