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2 years ago

Starting with Precambrian time, briefly describe how life on earth has changed over Earth's long history.

Biology

2 answers:

4vir4ik [10]2 years ago

4 0

Answer:

-New habitats created

-organisms evolved

-new organisms formed

-organisms become extinct

Explanation:

lara [203]2 years ago

3 0

Early pre-cambrian period the atmosphere consisted only of nitrogen and carbon dioxide without oxygen.

A Prokaryotic cell does not contain a nucleus. It only contains one chromosome and is a single-celled organism. It was the only form of life on earth for millions of years. Examples of a Prokaryotic cell are the different types of bacteria present today.

Autotrophs obtain energy by the process of photosynthesis. Any living organism need energy to survive and autotrophs are no different. Two types of autotrophs are present and they are Photoautotrophs and Chemoautotrophs. The Photoautotrophs rely on the energy produced during the process of photosynthesis and the Chemoautotrophs get their energy from most of the inorganic substances. Phtoautotrophs actually get their energy from the sunlight and then convert it into reusable form. In case of Chemoautotrophs ammonia is an important source of energy for them.

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In camels 1 hump is dominant to 2 humps if two camels breed and produce a camel with 2 humps what would be the possible genotype

Assoli18 [71]

Answer:

H=1hump

h=2humps

possible genotypes: HH Hh Hh hh... 1/4 chance they produce a camel with 2 humps.

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3 years ago

Action potential propagation in a skeletal muscle fiber ceases when acetylcholine is removed from the synaptic cleft. Which of t

klasskru [66]

Answer:

a) Acetylcholine is degraded by acetylcholinesterase.

Explanation:

After it binds for its receptor on the plasma membrane of the postsynaptic cell, acetylcholine must be removed in order to prevent repeated stimulation. Acetylcholinesterase is enzyme for the inactivation of acetylcholine, present at all cholinergic synapses. This enzyme hydrolyses acetylcholine and breaks it to the acetate and choline. Choline can be reused for the synthesis of the new acetylcholine molecule so it is taken back into the presynaptic cell.

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3 years ago

Examine the phylogenetic tree and use it to answer this question. which two organisms are most closely related? question 5 optio

slamgirl [31]

Brown algae and dinoflagellates

Reason: Because they are the closest being in the same branch, makes them the most related.

Hope this helps! :))

4 0

3 years ago

Which describes the Dewey Decimal system

GaryK [48]

Answer:

Option 2, or B: a way of classifying books

Explanation:

Dewey Decimal system definition = The Dewey Decimal Classification (DDC), colloquially the Dewey Decimal System, is a proprietary library classification system first published in the United States by Melvil Dewey in 1876.

What is the Dewey Decimal system? Well, the definition says it is a proprietary library classification system.

So..

Our answer is 2 or B: a way of classifying books.

Hope this helps!

- Melanie

8 0

2 years ago

Which of these is an example of elemental carbon?Diamond,methane,or proteins?

Masteriza [31]

Diamonds, as it contains carbon atoms in tetrahedral

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2 years ago