what are the contents of a mature pollen grain
Answer:
Mature pollen grains contain two cells: a generative cell and a pollen tube cell. The generative cell is contained within the larger pollen tube cell. Upon germination, the tube cell forms the pollen tube through which the generative cell migrates to enter the ovary.
Explanation:
What would happen to an ecosystem if an invasive
species has no predators? Explain in detail.
Please help!!!!!!!!!!
Explanation:
the top predator is removed from the delicate balance of any particular ecosystem, there may be disastrous effects for the other plants and animals that inhabit the environment.
When a top predator is removed from an ecosystem, a series knock-on effects are felt throughout all the levels in a food web, as each level is regulated by the one above it. This is known as a trophic cascade. The results of these trophic cascades can lead to an ecosystem being completely transformed. The impacts trickle down through each level, upsetting the ecological balance by altering numbers of different animal species, until the effects are finally felt by the vegetation
When a top predator is no longer present, populations of their herbivorous prey begin to boom. Without a top predator to regulate their numbers, these animals put a great deal of pressure on the existing vegetation that they require for food and can destroy large amounts of plant life, such as grasses and trees. This then causes further problems, such as soil erosion and loss of animal habitat. Eventually, humans are also impacted due to the resulting lack of soil fertility and clean water that depend on these plants.
Another problem involving the loss of vegetation is the competition that is created between herbivorous species. Competition between species for the remaining plant life is high and weaker species lose out to stronger ones, leading to the potential loss of weaker animals, as well as plant species. Increased competition, therefore, leads to a lack of biodiversity. In contrast, top predators often have varied diets, which means they can pursue a new food source if one is running low, preventing the first source from being eradicated completely. This is one of the ways that top predators are able to maintain biodiversity and the balance of an ecosystem.
The presence of a top predator also helps to maintain balance in an ecosystem by influencing the behaviour and movements of its prey through the fear of being caught. Animals that are prey to a top predator will move around in order to avoid it. This prevents plants and animals in any particular area of an ecosystem from being over-consumed, preserving food sources and habitats. In the absence of top predators, this regulation disappears, allowing certain areas of vegetation to be destroyed completely.
Answer:
That species would likely run rampid, due to it having no predators. The ecosystem may eventually recover, but it won´t be the same.
Explanation:
:) trust me!
Rainfall collects in a crack in a rock. When the temperature drops, this water freezes and expands. This causes the crack to become slightly larger is this weathering or erosion
Answer:
Weathering
Explanation:
Weathering - breaking down of rock.
Answer:
Weathering
Explanation:
5. Which of the following does NOT correctly match a fault with its boundary? *
A. normal fault & convergent boundary
B. normal fault & divergent boundary
C. reverse fault & convergent boundary
D. strike-slip fault & transform boundary
Within any ecosystem, there is a fixed amount of energy available for organisms to use. Since organisms usually produce more offspring than a given ecosystem can support, this causes _______.
A. bottlenecking
B. genetic drift
C. parasites
D. competition
what texture of song A house is not a home?
Answer:
huh?
Explanation:
8) What is the term for someone who is near sighted?
A) glaucoma
B) myopia
C) astigmatism
D) hyperopia
I need help with this work sheet please
Answer: 1. I would choose BbEe(black) and bbEe(chocolate) because when they crossover each other, one of the possibilities is bbEe which would be a yellow dog.
2. Yes, because when you cross the two, you will get at least 1 of each color as a result.
3. BE, Be, bE, be
4. When crossing BBee and bbee, the result was Bbee which is also a yellow dog.
5. I would not want BbEe.
6. When you cross bbEe and BBEE, the probability for a black dog would be 16/16. The other colors would be 0/16.
Explanation: If you need more help or have any questions, feel free to message. :3
The _____________ caused the movement of people to more urban areas.
Answer:
The growth of cities.
9. A person instinctively curls over his abdominal area in times of danger. Why?
Answer:
A person instinctively curls over his abdominal area in times of danger. Why? To prevent a smaller target and also to protect the internal organs and genitalia.
Explanation:
Do the people at T mobile keep your browser history and things like that??
Answer:
2x - 9y = 23
5x - 3y = -12x - 9y = 23
5x - 3y = -12x - 9y = 23
5x - 3y = -12x - 9y = 23
5x - 3y = -12x - 9y = 23
5x - 3y = -12x - 9y = 23
5x - 3y = -1
Explanation:
Please help... This is middle school stuff. It'll be easy for you.
Answer:
Volcano eruptions-when one plate is submerged below another, it melts and goes back to the surface as magma and creates a volcano
Earthquakes- when 2 plates slide against or hit each other
Seafloor spreading- where divergent plates move away from esch other, magma goes up to the surface and solidifies
Mountain formation- When two convergent continental plates hit each other. Continental plates are light so instead of submerging, they both rise higher to the surface and creates high land(mountains)
HOPE THIS HELPS!!!!
Why is the ovum so much bigger than a sperm cell?
1)It already contains all the chromosomes that will determine the zygote's traits.
2)It must store enough food for the growth of the zygote into an embryo.
3)Its big size allows the sperm to locate it better inside the oviduct.
4)A big ega is easier to implant in the uterus after tertilization.
Answer and I will give you brainiliest
Answer:
The answer would be number 2
Explanation:
human activity can affect ecosystems by removing producers, consumers and decomposers. What limiting factors may result from human actions, and what affects might they have on the flow of energy and matter in s ecosystem?
Environmental science
Answer:
asdasd as
Explanation:
dasdadsad
which cell is defective in situation 2? what happens to the hormone concentrations as a result of this defect?
Answer:
The defective cell is the M cell. due to the stimulation of Hormone A, cell M produces hormone B in large quantities by inhibiting the production of hormone A by cell D
Which is a key element found in all carbohydrates lipids proteins and nucleic acids
Answer:
try carbon
Explanation:
Answer:
carbon
Explanation:
i got it right
Which of the following structures assist the major structures of the digestive system?
A. gall bladder, small intestine, and liver
B .salivary glands, mouth, and esophagus
C. pancreas, gall bladder, and salivary glands
D. pancreas, stomach, and large intestine
Answer:
that would be C. pancreas, gall bladder, and salivary glands
What is a strict aerobe
An organism able to live and reproduce only in the presence of free oxygen (e.g., certain bacteria and certain yeasts). Organisms that grow in the absence of free oxygen are termed anaerobes; those that grow only in the absence of oxygen are obligate, or strict, anaerobes.
Question 8 (1 point)
Children who drink fluoridated water have a much higher incidence of dental caries.
True
Or false
Answer:
False
Explanation:
No need for one.
What is an example of mutation that could cause a phenotype that makes organism better suited for its environment?
Explanation:
for example:-If a mutation led to brighter feather colouring in birds, the brighter feathers may allow those individuals with the mutation to reproduce more frequently, because they are seen as being more attractive and a desirable mate.
wat could a dog living jow and a cat living thousands years ago have in common
Answer:
they would practically be the same
Answer:
They are both vertebrates and mammals, so they both have structures such as a backbone, hair, four limbs, four chambered heart, skull, etc.
A subscript shows a what......
Put the following images in order. ILL GIVE BRAINLIEST
Answer:
Explanation:
the daughter cells go last because it is the result
ignore this it’s for the c
In the 1950s, Stanley Miller and Harold Urey designed experiments that tested Alexander Oparin's and J.B.S. Haldane's hypothesis that conditions on the primitive Earth favored chemical reactions that synthesized more complex organic compounds from simpler organic precursors. Miller and Urey used an apparatus that recreated the conditions of what a primitive Earth was thought to consist of at the time. Methane, hydrogen, ammonia, and steam were all included to recreate conditions similar to that of a primitive Earth. Their goal was to create complex organic molecules from the simple organic molecules that were believed to be part of primitive Earth's makeup. The Miller-Urey experiment was run for a week and the samples collected were analyzed. Analysis showed that some of the carbon in the apparatus was converted to amino acids molecules. In later experiments, similar to Miller and Urey's, it has been shown that it is possible to form all 20 amino acids commonly found in organisms. Along with nucleic acids, other molecules were detected in samples. Some of these were sugars, lipids, adenine, and even ATP in certain conditions.
Based on the information in The Miller-Urey Experiment reading passage above, which of the following statements is most accurate?
Answer:
where are the following statements
Explanation:
Which statements correctly describe greenhouse gases in the
atmosphere?
Choose all that apply:
Greenhouse gases absorb infrared radiation from Earth's surface.
Greenhouse gases allow the sun's rays to pass through.
Greenhouse gases are
released when the sun's rays hit Earth.
Greenhouse gases absorb all kinds of radiation that falls on them.
How does anaphase 1 in meiosis differ from anaphase in mitosis
Answer:
The differecnce is in the amount of DNA present and what type. In meiosis you have a diffrent amount of DNA than mitosis and the DNA in meisosis has done crossing over aand is different than the original. Mitosis is exactly the same
Explanation:
The period between the entry of micro organism into the body and the start of the diseases is referred to as
Answer:
Incubation period
Explanation:
The incubation period occurs in an acute disease after the initial entry of the pathogen into the host (patient). It is during this time the pathogen begins multiplying in the host
Please HELP ME ASAP I WILL GIVE YOU BRAINLEST Question 4 (3 points)
Which of the following processes is NOT a way that carbon could move between the atmosphere and the biosphere?
Question 4 options:
respiration (breathing)
combustion (burning)
deep burial, compaction, and cementation
photosynthesis
Question 5 (2 points)
What is the only natural way that carbon can move OUT of the geosphere?
Question 5 options:
burning of fossil fuels
volcanic eruptions
dissolution
decomposition
Question 6 (1 point)
Which carbon reservoir contains the MOST carbon?
Question 6 options:
fossil fuels
atmosphere
land biomass
rocks
Question 7 (2 points)
Which carbon reservoir changes the quickest and has the biggest direct effect on climate?
Question 7 options:
land biomass
ocean
atmosphere
rocks
Question 8 (2 points)
Which best describes the process of ocean acidification?
Question 8 options:
The ocean absorbs more human-produced CO2, causing the acidity to increase
The ocean releases more human-produced CO2, causing the acidity to decrease
The ocean absorbs more natural CO2, causing the acidity to decrease
The ocean receives more polluted runoff, causing the acidity to increase
Question 9 (2 points)
What is a potential impact of ocean acidification?
Question 9 options:
Animals will have a harder time building their shells
Corals may have a harder time building their skeletons
Ocean ecosystems may suffer, making it harder for humans to get food from the ocean
All of the above
Answer:
photosynthesis
Explanation:
as plant need carbon dioxide for making food so carbon does not release