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ELEN [110]
2 years ago
12

HELP ME GUYS PLEASE!

Biology
2 answers:
german2 years ago
8 0

Answer: number 1

Explanation: that is when we could first sustain life because that is when we gained atmosphere and when we could hold carbon and oxogen

olga2289 [7]2 years ago
7 0

Answer:

I think the answer was A. Because before the ozone layer oxygen was not as much for life on earth to evolve so once the ozone layer started to form up it kept organisms and earth surface safe from direct uv lights so life started evolving.

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On-center cells: A. are excited by light that falls in the periphery of their receptive field. B. are excited by light that fall
Elena L [17]

Answer: B) are excited by light that falls in the center of their receptive field.

Explanation:

There are two types of bipolar cells present in the retina which are differentiated on the way the centres of their receptive fields respond to light. The names of bipolar cells are ON-centre and OFF-centre.

If a light fall at the centre of the receptive field of a bipolar cell, it will experience an exciting effect on that cell, resulting in it being depolarized, it is an ON-center cell.

Hence, the correct option is B.

6 0
3 years ago
Is oxygen necessary for the production of apt in your cells?
gizmo_the_mogwai [7]
Yes it is necessary for the production of apt in your cells because apt needs oxygen to form correctly.
7 0
3 years ago
Humans cultivate plants that house bacteria in soil to convert ammonia and ammonium ions to ___________________.
Pepsi [2]

Answer:

<em>Humans cultivate plants that house bacteria in soil to convert ammonia and ammonium ions to </em><u><em>nitrate</em></u>

Explanation:

8 0
2 years ago
A person who has type AB blood and is heterozygous for Rh factor has children with a person who is heterozygous for type A blood
MatroZZZ [7]

Blood type is determined by the alleles coding for the antigen present on cell membranes.

The person with type AB blood has a heterozygous Rh factor.

  • Half the gametes have Rh factor (+) and the other half are negative for Rh factor (-)
  • Half the gametes have IA and the other half have IB
  • The possible gamete combinations are IA+, IA-, IB+, IB-

The person with heterozygous type A blood is negative for Rh factor

  • All gametes are negative for Rh factor (-)
  • Half the gametes have IA and the other half have IO
  • The possible gametes are IA-, IO-

The genotype ratio is 1:1:1:1:1:1:1:1

The phenotype ratio is 2: 2:1:1:1:1.

Learn more about blood types here:

brainly.com/question/21209477

#SP10

8 0
2 years ago
In prokaryotes, which component must disassociate to allow for elongation of the transcriptional complex? In prokaryotes, which
qaws [65]

Answer:

sigma subunit

Explanation:

Sigma subunit of RNA polymerase holoenzyme directs the enzyme towards the consensus sequences present upstream of the transcription start site. Completion of the initiation phase of transcription is followed by dissociation of sigma subunit from the transcription complex.

The protein NusA replaces the sigma subunit. The RNA polymerase leaves the promoter and starts the elongation

.

4 0
3 years ago
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