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balandron [24]
3 years ago
12

Which came first? 1. Plants Become Abundant

Biology
1 answer:
lesya [120]3 years ago
6 0

Answer:

first bird appear

Explanation:

because e

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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*

Single comb - two recessive alleles are present at the first and the second locus  - rrpp

Parent are rose combed and pea combed

For being rose genotype must be R* pp

and for being pea combed genotype must be rr P*

Rr pp x rr Pp

will  produce

Walnut comb  with genotype Rr Pp

Single comb  with genotype rrpp

and pea comb  with genotype rrPp

Hence, option B is correct

8 0
3 years ago
Read 2 more answers
Match the chemical signal with the appropriate description.
Lyrx [107]
<span>a. chemicals produced by neurons that function as hormones—neurohormones
b. chemicals that act locally on nearby cells—paracrine factors
c. chemicals secreted by presynaptic terminal—neurotransmiters
d. influences same cell type from which it is secreted—autocrine agent
e. chemical secreted into the blood by specialized cells; travels some distance to target tissues—endocrine hormones</span>
3 0
3 years ago
What is the expected colorimetric result from the negative control in your assay?
mote1985 [20]
<span>3,3',5,5'-Tetramethylbenzidine or TMB is a chromogenic substrate visualising reagent used in enzyme-linked immunosorbent assays (ELISA), it yields a blue color when oxidized, typically as a result of oxygen radicals produced by the hydrolysis of hydrogen peroxide by HRP, (thermofisher). The expected colorimetric result from the negative control in your assay will be no development of blue color</span>
5 0
3 years ago
How does osmosis help maintain body cells at a specific concentration?<br> Simple please
Svet_ta [14]
It is when the inclination of atoms of a dissolvable to go through a semipermeable layer from a less amassed arrangement into a more focused one, evening out the fixations on each side of the film.

I hope the answer will help you. 
4 0
3 years ago
The relationship between humans and their digestive bacteria can be described as... A) Commensalism B) Competition C) Mutualism
Flura [38]

Answer: The correct answer is -

C) Mutualism.

Explanation:

Mutualism is a type long term biological relationship between two organisms belonging to same or different species in which both are benefitted from one another.

For example - E.coli bacteria, present large intestines of human, gets food and place to live in our digestive tract. In return, the bacteria produce vitamin K, which make it harder for other disease causing bacteria to establish in our system.

Thus, option C) is the right answer.

7 0
3 years ago
Read 2 more answers
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