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stiv31 [10]
3 years ago
12

Which statement explains something that the fossil record indicates?

Biology
2 answers:
AleksandrR [38]3 years ago
7 0

Answer:

Mass extincions have occured several times on Earth.

Explanation:

mash [69]3 years ago
3 0

Answer:

C.     Mass extincions have occured several times on Earth.

Explanation:

took the test :)

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How do animal cells, Plant cells, freshwater protists, and
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Plant cells deal with osmosis by being enclosed in a cell wall.

Animal cells use active transport systems to deal with the problem of osmosis.

Fresh water protists have contractile vacuoles to deal with osmosis.

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Explanation:

Plant cells have a rigid cell wall. If a plant cell is places in a place where the conditions are hypotonic, then the cell will tale up water by osmosis but the cell wall will prevent it from bursting. This condition is termed as the cell being 'turgid'.

As animal cells do not have the rigid cell wall, they use the mechanism of active transport system to stop the cell from bursting during osmosis. In this process, ions are moved out of the cell so that the pressure in the cell due to osmosis can be reduced.

Fresh water protists have a structure present in them called as the contractile vacuole. The contractile vacuole has the capability to remove any excess water from the cell as well storing water if there is not enough water.

Bacteria have peptidoglycan cell walls to prevent osmosis.

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3 years ago
What are the general features of the prymnesiophyceae
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Answer:

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  3. It has flagella (usually two) known as haptonema. These structures help in attachment and feeding.
  4. The plastids are surrounded by four-layered membranes.
  5. Its species are mostly found in the marine environment, thus classified as phytoplanktons.
  6. Many members of prymnesiophyceae have cell covering made up of calcium carbonate. These structures are known as coccoliths.

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3 years ago
Which of these is the system of classifying living things into categories, based on physical and chemical features?
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