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Fittoniya [83]
3 years ago
6

Which fossils provide information as to the mode of formation of an oxygen-rich atmosphere by about 2 billion years ago?

Biology
1 answer:
Oksanka [162]3 years ago
7 0

Answer:

The fossils that provide information on the formation of an oxygen-rich atmosphere are the stromatilites from the Precambrian era. These are layered and columnar fossils consisting mainly of cyanobacteria which were the original life form back then. These bacteria took in carbon dioxide and produced oxygen by photosynthesis as early as 2.5 billion years ago (the earth is about 4.5 billion yrs old).

Explanation:

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Which do you think would adapt and survive overtime to a mass extinction? A starfish or an eel?
Harlamova29_29 [7]

Answer:

Starfish

Explanation:

This is an opinion questions, so there really isn't a right or wrong answer.  You could just as easily choose Eel.  Your task is to pick one and defend your reasoning.

I chose starfish because starfish have a long history of demonstrated adaptability to a wide variety of conditions.  Their armored skin protects them from a variety of predators, as does the poison that many of them contain.  They have the ability to regrow limbs, and even regrow entire starfish from certain body parts.  When it comes time to breed, starfish meet together in groups.  Each female releases a few million eggs from the gonads in each of her arms.  Each male then releases billions of sperm from each gonad in each of his arms, thus covering the eggs with sperm to fertilize them.

3 0
2 years ago
If tips of grasses or sugar cane are removed they keep growing in length
Nikitich [7]

Answer:

Presence of intercalary metristems.

Explanation:

Makes the sugar cane grow in length even if the tips are removed.

7 0
3 years ago
An earthquake causes the size of a deer population to drop rapidly over a short period. allele frequencies shift. what mechanism
Maru [420]
Genetic drift or bottleneck effect
4 0
3 years ago
What is theaw of superposition? How is it used to understand how old the Earth is?
MatroZZZ [7]
Hey The Law of Superposition makes logical sense but in practice it is the nature of the fossils found in the sedimentary layers that determine the relative ages of the rocks. Hope it helps
5 0
3 years ago
Which of the following terms does not apply to birds?
Maurinko [17]

Answer:

Viviparous

Explanation:

5 0
2 years ago
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