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bija089 [108]
2 years ago
9

Which of the following gases was most likely present in earths earliest atmosphere

Biology
2 answers:
Nikitich [7]2 years ago
8 0

Oxygen, because water must have been present when Earth first formed.

Nady [450]2 years ago
7 0

the correct answer is hydrogen

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When an animal runs along the ground by flexing some of its muscles, what causes its muscles to contract?
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An AAaa tetraploid plant undergoes self-fertilization. At least two dominant A alleles are needed to obtain the dominant phenoty
MatroZZZ [7]

Answer:

The frequency will be  35/36

Explanation:

An AAaa tetraploid plant will only produce a gamete which will be Aa, but during a self crossing a progeny with genotype AAaa will be produced and this will happen at a frequency of 35/36 and this simply means that the progenies produced during the self crossing  will all have a dominant phenotype

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2 years ago
How are vascular and non-vascular plants different, and how do each of them work through osmosis?
Lilit [14]

Answer:

Explanation:

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How vascular plants work through osmosis

The xylem of vascular plants consists of dead cells placed end to end that form tunnels through which water and minerals move upward from the roots to the rest of the plant. Through the xylem vessels, water enters and leaves cells through osmosis.

How non vascular plants work through osmosis

Because non vascular plants do not have the xylem and phloem ystem, they absorb water right into their cells through their leaves when it rains or when dew falls. Internal cells get their water by passive osmosis. While, they use rhizoids to transport nutrients and minerals.

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The fins of lobe-finned fish are supported by extensions of the skeleton and are moved by muscles within the fin whereas the fin
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