Answer:
They used clear glass
Explanation:
Answer:
Most ancient lenses are convex and were used to magnify. At Carthage there are 14 glass lenses and two of rock crystal stored in a drawer in the museum; they have apparently never been displayed.
Explanation:
Which of the following statements is true?
Opportunistic bacteria only cause infection under certain conditions.
Most bacterial infections are caused by bacteria already in the body.
Leukocytes are the first line of defense against pathogenic microorganisms.
The flu and the common cold are treated with rest, fluids, and antibiotics.
Answer:
1 one is true
2 is true
3 is falase
Answer:
a
Explanation:
Bacteria cannot survive in deep ocean areas where no light is present. true or false
Answer:
false on edge
Explanation:
what is the key to natural selection ?
Answer:
Survival of the fittest?
What are the building blocks of proteins? If all proteins are made of the same
building blocks, how can there be so many different types of proteins with different
functions?
Answer:
The basic building blocks of proteins are called amino acids. In proteins, amino acids are arranged into a linear molecule called a polypeptide chain. Some proteins only consist of a single polypeptide chain while more complex proteins are made out of multiple polypeptide chains bonded together.
Explanation:Proteins are formed out of long linear molecules of amino acids called polypeptide chains. The identity and function of a protein are determined by its sequence of amino acids and the 3-D structure of its polypeptide chains. Amino acids are stored in DNA in the form of sequences of nucleotide bases.
What would happen to a species if it was quickly moved from a familiar environment to an extremely different environment.
Which of the following can cause the extinction of a species?
climate change
catastrophic events
interactions with other species
human activities
Answer: human activities
Explanation:
A 100 kg box is initially at rest on a level surface. One 10 N force acts on the box , directed toward the right. A second 10 N force acts simultaneously on the box , directed toward the left , as shown.
Since 10 N forces are acting from both sides, these are balanced forces and the box will not move because balanced forces are acting on it. So the correct option is D.
What are balanced forces?Forces that are equal in magnitude and opposing in direction are said to be balanced forces. Equilibrium is seen as a condition of balanced forces. There is no shift in direction when the forces are in balance.
Balanced combined forces have always been equal to zero. These are vectors for merging. Balance forces cannot alter an object's momentum or direction.
An item is kept traveling at a constant speed by a balanced force. In it, Newton's First Law of Motion is explained. A good illustration of a balanced force is a book on the table. The normal force (support force) of the table balances out the weight of the book. The two forces are exactly equal and opposed to one another.
While forces that are balanced can keep an item at rest or move at a steady speed, unequal forces can cause things to accelerate.
Therefore the correct option is D.
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Predation is when a predator feeds on another organism, which is referred to as the predator's prey.
True
False
Answer:
True
Explanation:
Predation is another mechanism in which species interact with each other. Predation is when a predator organism feeds on another living organism or organisms, known as prey. The predator always lowers the prey's fitness. Also, a predator is an organism that eats another organism. The prey is the organism which the predator eats. Some examples of predator and prey are lion and zebra, bear and fish, and fox and rabbit.
Which of the following is found in the cells of
fungi but NOT of archaebacteria?
A ribosomes
B cell membrane
C DNA
D nucleus
Answer: im 90% sure its (d)
According to the question option "D" Nucleus is found in the cells of fungi but NOT of archaebacteria.
What is the difference between fungi and archaebacteria?
Fungi cell walls usually are constructed of chitin whereas Eubacteria cell walls have peptidoglycan.
Archaebacteria do not have either substance, although the cell walls of some archaebacteria contain a substance similar to peptidoglycan.
Thus, the option "D" Nucleus is found in the cells of fungi but NOT of archaebacteria.
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Which is the best description of the cause of sound waves? *
Answer:Sound waves are caused by the vibration of the oceans floor like a underwater volcano causes the water to vibrate
Explanation:
Which best explains parallel forces?
left and right forces that can be added together
right and upward forces that cancel each other out
addition of parallel forces that cannot result in a negative force
left and downward forces that cancel each other out
Answer:
A
Explanation:
edu 2020
Statement that best explains parallel forces is left and right forces that can be added together.
What is a parallel force?parallel force can be regarded as the forces that act in the same direction, it could also be the force that act at opposite directions on an object.
Therefore, parallel forces are left and right forces that can be added together.
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All substances are built from
compound
oxygen
metals
atoms
Answer: All substances are built from
compound
oxygen
Explanation:
All substances are built from atoms as atoms are the basic building blocks of matter and are the smallest units of a chemical element. The correct option is D.
Atoms form the basis of all compounds. The fundamental building blocks of matter, atoms are the smallest units of a chemical element that nonetheless retain that element's chemical characteristics.
Atoms from various elements combine chemically to produce compounds, however compounds themselves are not the basic building blocks.
Although oxygen is an element that is present in several substances, it is untrue to say that oxygen is the primary component of all substances.
Although metals are a specific kind of element, not all substances are made of metals. Thus, the most correct response is that all substances are composed of atoms.
Thus, the correct option is D.
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Your question seems incomplete, the probable complete question is:
All substances are built from
A. compound
B. oxygen
C. metals
D. atoms
Which one is the correct answer?? The lined squares in the Punnett square represent____.
They represent the parent's genotypes.
What are the effects of greenhouse gases on Earth?
Answer:
greenhouse gasses get trapped in the atmosphere and contribute to global warming
Answer: The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without this atmosphere.
Explanation:
The first line of defense involves which structure(s)?
OT-cells
O skin
O blood
OB-cells
Answer:
skin
Explanation:
The skin is vital for our general health and well-being. In addition to acting as the body's first line of defense against bacteria and viruses, healthy skin also maintains fluid balance and helps regulate body temperature. She is very sensitive, she recognizes the slightest touch as well as pain.
As an outer layer that we can see and touch, the epidermis protects us from toxins, bacteria, and fluid loss. It consists of 5 sublayers of keratinocyte cells. These cells, produced in the deepest inner, basal layer, migrate to the surface of the skin. As they do so, they mature and go through a series of changes.
What do the enzymes in excision repair systems do?
A destroy cancer cells
B cut off telomere sections
C replace dna damaged by chemicals
D replace rna primers with dna
What make a dwarf planet different from a planet?
A.
Dwarf planets are usually smaller than the moons of a planet.
B.
Unlike planets, dwarf planets do not have natural satellites.
C.
Planets have cleared their orbital paths of debris, while dwarf planets have not.
D.
Planets have a nearly spherical shape, while dwarf planets are irregular in shape.
E.
Dwarf planets do not orbit in the same plane as the other planets.
Answer:
Dwarf planets are usually smaller than the moons of a planet.
Explanation:
Answer: C
Explanation: dwarf planets lack the gravitational forces needed to pull in and accumulate all of the material found in their orbits.
edmentum-2022
Someone help me pleaseee with the answers to both of em
Make a list of different weather patterns
Weather comes in all different forms, and it changes by the day. It could be sunny one day and raining the next. It could even be sunny, rainy, cloudy, and stormy in one day.
Common Types of Weather Elements
The weather has a lot of different factors. When someone asks how the weather is today, you need to think about temperature, humidity, precipitation, wind, cloudiness, and atmospheric pressure. All these different parts work together to create the weather you see when you walk out the door.
Vaporization is the reserve of what?
Answer:
Vaporization is the reserve water
Explanation:
Which of the following statements about eukaryotic cells is NOT
true?
Eukaryotic cells have a membrane-bound nucleus
Eukaryotic cells are more complex than are prokaryotic cells.
Eukaryotic cells are believe to
e evolved more recently than
prokaryotic cells.
Eukaryotic cells are usually smaler than prokaryotic cells
Answer:
Eukaryotic cells are believed to be evolved more recently than prokaryotic cells.
Explanation:
The statement about eukaryotic cells is NOT true - Eukaryotic cells are usually smaller than prokaryotic cells
Cells are fundamental units and are mainly two types eukaryotic cells and prokaryotic. There are various structural and functional differences and similarities found in them.
Prokaryotes and eukaryotic cells have the following difference:
Prokaryotic cells lack a true nucleusProkaryotic cells lack other membrane-bound organelles.Eukaryotic cells have more organelles, enzymes, and molecules, therefore, prokaryotic cells are simpler.Prokaryotic cells are comparatively smaller than eukaryotic cells.Prokaryotic cells are evolved before eukaryotic cells.Thus, the statement about eukaryotic cells is NOT true - Eukaryotic cells are usually smaller than prokaryotic cells
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There are some similarities between prokaryotic and eukaryotic cells. Which of the following structures is found in both prokaryotic and eukaryotic cells?
Answer:
Plasma membrane, cytoplasm, ribosomes, and DNA.
Explanation:
There are what eukaryotes and prokaryotes have in common.
What is the difference between prokaryotic and eukaryotic cells?
The main difference that separates prokariotic organisms from eukaryotic organisms is the organisation of the genetic material. Prokaryotes have a single chromosome that isn't separated by a membrane and it's called nucleoid. Eukaryotes have multiple chromosomes that are inclosed in a nuclear envelope(nucleus).
The only organelles present in prokaryotic cells are the ribosomes(70S) which differ from the eukaryotic ribosomes(80S). Eukaryotic cells have membrane bound organelles like the mitochondrion or Golgi aparatus.
Explain how specific proteins are formed from a strand of mRNA.
Answer:
During translation, ribosomes move along an mRNA strand, and with the help of proteins called initiation factors, elongation factors, and release factors, they assemble the sequence of amino acids indicated by the mRNA, thereby forming a protein.
Explanation:
Answer:
Explanation:
Los ARN mensajeros, también conocidos como ARNm, son uno de los tipos de ARN que se encuentran en la célula. Éste en particular, como la mayoría de los ARN, se sintetiza en el núcleo y luego se exporta al citoplasma, donde la maquinaria de traducción, la maquinaria que realmente fabrica las proteínas, se une a las moléculas de ARNm y lee en ellas el código para producir una proteína específica. Así que en general, un gen, el ADN de un gen, puede ser transcrito en una molécula de ARNm que puede acabar dando lugar a una proteína específica.
In which cellular organelle is genetic information (DNA) held?
A. Mitochondria
B. Ribosomes
C. Cell membrane
D. Nucleus
Answer: d. nucleus
Explanation:
Which statement about photosynthesis and cellular respiration is true
a) Photosynthesis releases oxygen and respiration uses it
b) Respiration uses water and photosynthesis releases it
c) Photosynthesis uses oxygen and respiration releases it.
d) Both respiration and photosynthesis use oxygen from the atmosphere
Answer:
d
Explanation:
If an organism has 30 chromosomes in its body cells, how many chromosomes would it have in its sex cells (gametes)?
Answer:
15
Explanation:
Gametes have half the amount of dipliod somatic ells
Why are packed juices contaminated with yeast
Answer:
It is because yeast is responsible to fix the carbon dioxide.
Some viruses attack cells by inserting their own DNA into the host cells’ DNA. Why might it be simpler for these viruses to attack prokaryotic cells than eukaryotic cells?
A. Prokaryotic cells have less DNA than do eukaryotic cells.
B. The rapid growth of prokaryotic cells generates more viruses.
C. Unlike eukaryotic cells, prokaryotic cells do not have a nucleus.
D. The cell wall in prokaryotic cells is a less effective barrier.
Answer:
C
Explanation:
Because eukaryotes have membrane bound nucleus where they store their generic information
What Bacteria is put in yougurt ?
Answer:
food bateria
Explanation: