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Airida [17]
3 years ago
12

Why do scientists that that photosynthetic prokaryotes were probably not the first life forms on earth

Biology
1 answer:
Tanya [424]3 years ago
4 0
I'm not sure. But I think that it is bc the first cell must have been very simple, so doing a process like photosynthesis is very complex.
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Physical and chemical changes occur during digestion an example of a chemical change during digestion is
leva [86]

Answer:

Explanation:

Mechanical digestion physically breaks down food, like when teeth macerate food into a bolus. The stomach contracts and relaxes in a churning motion. ... Chemical digestion occurs when the bonds within larger food molecules are broken, creating smaller molecules that the body can use.

6 0
4 years ago
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What causes polio?<br> How does polio affect a nerve?
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The Polio virus usually enters the environment in the feces of someone who is infected
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4 0
3 years ago
Roan coat color in cattle develops through incomplete dominance of the gene for red color and its allele for white. what crossin
slava [35]
<span>Roan is a combination of white hairs with red hairs. When we see cattle like this, they look pink because it resulted from a mix of white and red.

Red allele: A
White allele: a
</span>
<span>A heterozygotic animal has this genotype: Aa
Like i said previously this is the mixture of colors so the animal would be pink.

A red coat color has this genotype: AA
A white coat color has this genotype: aa

To get all the herd to be</span><span> roan-colored cattle the combination of parents should be: AA x aa. -> 100% roan
Another possible way to obtain would be</span><span>roan-colored cattle: Aa x Aa or aa x Aa (in this case there would be less probabable to obtain road).</span>
8 0
4 years ago
Which of the following correctly describes the structure of the typical eukaryotic genome?
KonstantinChe [14]

Answer:

Diploid.

Explanation:

DNA is present in the genetic material of all the eukaryotic and prokaryotic organisms.The eukaryotic genome contains DNA wraps around the histone proteins. Multiple distinct chromosomes are present in the eukaryote genome.

The eukaryotic genome are generally linear structure with the two copies of each chromosome. This makes the eukaryotic genome as diploid structure.

Thus, the correct answer is option (1).

5 0
3 years ago
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Exam
vredina [299]

Answer:

B

Explanation:

just like that

8 0
4 years ago
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