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MrRissso [65]
3 years ago
8

How old do scientists believe was the earliest cell on earth?

Biology
1 answer:
Kipish [7]3 years ago
8 0

Answer:

about 3.7 billion years

The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old. The signals consisted of a type of carbon molecule that is produced by living things.

Explanation:

hope it will help you

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The rate at which blood flows through the human body changes in response to many factors. Which statement describes one of these
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Why does Isaac Newton's work finally confirm the heliocentric model? ANSWER QUICKLY!!!! I will give you BRAINLEST
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The answer is by proving that gravity and inertia working together explained the motions of planets and their moons.

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3 years ago
Which condition causes fatty substances to build up in blood vessels?
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Atherosclerosis is a condition that occurs when fatty substances (plaque) build up in blood vessels. The accumulation of the fatty substances can cause partial or complete blockage of blood flow through an artery. Symptoms of this condition include a mini-stroke, pain in the chest <span>and pain in the leg muscles during exercise.</span>




3 0
3 years ago
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`there is one base that is not found in dna, but it is found in rna. which one is it?
Lorico [155]
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6 0
3 years ago
Small body (nb), short spines (Is) and amoral are three recessive traits in stick the genes of which are linked on the same chro
melomori [17]

Answer:

The three genes in coupling are in repulsion.

Explanation:

Coupling happens when the dominant alleles and the recessive alleles are on the same homologous chromosome, while the repulsion happens when one chromosome has one dominant allele and one recessive allele and another homologous chromosome also has dominant and recessive alleles.

If the progeny has:

nb+ ls+ a/nb ls a ⇒ nb+ ls+ a

nb ls a+/nb ls a ⇒ nb ls a+

Where nb+ ls+ a is the dominant alleles and nb and nb+ is in middle.

ls+ nb+ are on the same chromosome (both dominant)

ls nb are on the same chromosome (both recessive)

ls nb, these two are in coupling with each other, but ls+ and a are on the chromosome and ls+ or nb+ are dominant, while nb+ and a are recessive on form a, thus, ls and nb, they are in repulsion with a.

3 0
3 years ago
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