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Lesechka [4]
2 years ago
9

How is modern Earth different from Earth over four billion years ago?

Biology
2 answers:
Gelneren [198K]2 years ago
3 0

Answer:

D, over the past Billions of years, our atmosphere has formed to protect life.

Sergeeva-Olga [200]2 years ago
3 0

Answer:

B. Little to no oxygen

Explanation:

The atmosphere on the primitive Earth over four billion years ago was reducing. It did not have oxygen or oxygen was present in very little amount. The present-day atmosphere of today's Earth is rich in oxygen.  

Evolution of oxygen-evolving autotrophic cyanobacteria led to the accumulation of oxygen in the atmosphere of primitive Earth.  

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DNA fingerprinting is where DNA is used to create a profile for someone often in crimes. The STR or Short Tandem Repeats are used for this. STRs are non-coding sections of DNA which repeat themselves for example CACACACACACACACACACA the location of this STR and the length of the STR (how many times it repeats) are used to identify a specific person
7 0
3 years ago
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Which of the following individuals would MOST likely have the lowest basal metabolic rate?
shepuryov [24]

Answer:

The preferable option will be - B.

B. A 28-year-old anorexic female

Explanation:

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The BMI categories are -

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5 0
3 years ago
2. What muscle (with two heads) allows you to flex your arm?
klio [65]

Answer:

Answer is Biceps brachi.

8 0
2 years ago
Over 1,800 mutations have been described within the CFTR gene. These mutations can be readily detected using PCR and DNA sequenc
sertanlavr [38]

Answer:

The correct answer is - option C.

Explanation:

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As the disease is a recessive disease, for the mutant phenotype to expressed both copies of the allele required to be recessive.

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8 0
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