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MrRa [10]
3 years ago
6

Ninety nine percent of the atmosphere is composed of _____ and _____.

Biology
2 answers:
VARVARA [1.3K]3 years ago
8 0

Answer:

Ninety nine percent of the atmosphere is composed of Nitrogen and Oxygen

Alexeev081 [22]3 years ago
4 0

Answer:

78% nitrogen and 21% oxygen

Explanation:

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In chickens, comb shape is determined by two independent genes (R and P). A walnut comb is produced when at least one dominant a
Aleksandr [31]

Answer:

Option B, Rr pp × rr Pp

Explanation:

Given

Walnut Comb is produces when  one dominant allele R is present at one gene locus and at least one dominant allele P is present at a second gene locus - R* P*

Rose Comb - at least one dominant allele is present at the first locus and two recessive alleles are present at the second locus - R* pp

Pea comb - two recessive alleles are present at the first locus and at least one dominant allele is present at the second  - rr P*

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and for being pea combed genotype must be rr P*

Rr pp x rr Pp

will  produce

Walnut comb  with genotype Rr Pp

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and pea comb  with genotype rrPp

Hence, option B is correct

8 0
3 years ago
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