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MatroZZZ [7]
3 years ago
13

Who recognized that different layers of rock contained unique collection of fossils?

Biology
2 answers:
andreev551 [17]3 years ago
7 0
I think it's Nicklaus Steno
aleksandrvk [35]3 years ago
7 0

John Ray first recognized it. (I got this from wikipedia so you know)

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A pure breeding tall pea plant was crossed to dwarf plant. What will be frequency of dwarf plants in F2?
Temka [501]

Tall pea plant was crossed to dwarf plant. The frequency of dwarf plants in F2 will be 0%.

  • A true breeding pea plant is one that, after self-fertilization, only bears offspring with the same traits.
  • True breeding organisms are those that share the same genes for the desired traits and are genetically comparable.
  • These animals possess homozygous alleles. If the alleles are distinct, only one of the gene's alleles—referred to as the dominant gene—will be expressed.
  • The other allele, referred to as the recessive one, has no effect.

According to the given cross:

                                  TT  X  tt   (parents)

                                 Tt Tt Tt Tt  (offspring) all tall

Hence the percentage of dwarf individuals is 0.

Learn more about pea plant here: brainly.com/question/1483517

#SPJ1

3 0
2 years ago
Which carbohydrate(s) are structural compounds?
muminat

Answer:

Carbohydrates are important macromolecules that consist of carbon, hydrogen, and oxygen. They are organic compounds organized in the form of aldehydes or ketones with multiple hydroxyl groups coming off the carbon chain.

Explanation:

7 0
3 years ago
What occurs if a t cell binds to an antigen and the t cell does not receive a co-stimulatory signal?
tresset_1 [31]
The correct answer is that "the T cell enters a state of anergy".

The activation of T cells requires two signals: (1) antigen specific signal presented by an antigen presenting cell (either a macrophage or a dendritic cell) that activates t cell receptors and (2) co-stimulatory signals that is not antigen specific but rather found in the plasma membrane of the antigen presenting cell (i.e. CD28). In the absence of a co-stimulatory signal, the t cell will enter a state of anergy or the inability to produce an immune response toward an offending antigen.
4 0
3 years ago
Which statement about climax community is true?
Svet_ta [14]
The answer to this question is c! Thanks for posting your questions!

6 0
3 years ago
Read 2 more answers
The ocean contains vast amounts of salts and other minerals. For example, 1 cubic kilometer of ocean water contains about 5,000
valina [46]

Answer:

The ocean is rich.

Explanation:

4 0
3 years ago
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