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pychu [463]
3 years ago
10

I need help.... Cyanobacteria formed colonies called stromatolites. These used to be plentiful. What role did they contribute to

the atmosphere?
Biology
1 answer:
frutty [35]3 years ago
5 0
Answer - Cyanobacteria aka Algae that contributed in creating O2 for the atmosphere as a byproduct thru Photosynthetic.

Reason - Of course Algae make up mainly the whole world in waters and they do photosynthesis to give off oxygen in the atmosphere.
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8. In a population of beetles, there is a gene for color with two codominant alleles. The allele R leads to red beetles and the
Eddi Din [679]

Answer:

The genotypic frequency = 1:1

The phenotypic frequency = 1:1

Explanation:

Given that:

The allele → R = Red beetles

The allele → B = Blue beetles

Since the gene color shows a codominant allele

The Red Beetle = RR

The blue beetles will be = BB

The heterozygous beetle will be = RB

∴

The punnet square showing the crossing of RB × RR is:

                R                   B

R                RR               RB

R                RR               RB

The result shows that we have two red beetles and two heterozygous beetles.

Hence;

The genotypic frequency = 1:1

The phenotypic frequency = 1:1

8 0
3 years ago
What would happen if the ribosomes did not do their job?
telo118 [61]

Ribosomes are organelles that create proteins. Cells use proteins to perform important functions such as repairing cellular damage and directing chemical processes. ... Without these ribosomes, cells would not be able to produce protein and would not be able to function properly.

4 0
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Excitatory neurotransmitters do which of the following?
Alisiya [41]

Answer:

d. All of the above

Explanation: is correct

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