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Vladimir79 [104]
3 years ago
10

Internal and external fertilization both _____. _____ Select one: a. produce single-celled zygotes b. occur only among invertebr

ates c. occur only among terrestrial animals d. depend on the use of copulatory organs e. occur only among birds
Biology
1 answer:
Natali [406]3 years ago
6 0

Answer:

Option-A

Explanation:

Fertilization refers to the fusion of the male and female gamete to form the zygote.

When the fertilization occurs inside the organism through insemination then it is known as the internal fertilization and when it occurs outside the organism like observed in the amphibians when male and female gametes fuse in the water is known as external fertilization.

Both are different type of fertilization but share a similarity that is the formation of a single cell called the zygote which grows into the embryo by the mitotic division. The embryo later develops into the organism.

Thus, Option-A is correct.

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IF:
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b) How many times would the total DNA from the average human stretch from Earth to the Sun and back?
The answer is concluded from the ratio of the total DNA length (T) and the <em>twice </em>(because of stretch to the Sun and back, thus, <em>two directions</em>) of distance from <span>Earth to the Sun (ES) and :
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<span>      ⇒ R = 0.6677* 10^{3}
</span><span>      ⇒ [tex]R = 667.7
</span>Thus, 667,7 times will the <span>total DNA from the average human stretch from Earth to the Sun and back.</span>
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