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3 years ago

4

Biology

2 answers:

Gwar [14]3 years ago

6 0

Answer is Mammals first appeared Dinosaurs had become extinct.This statement is true.

patriot [66]3 years ago

5 0

Answer:

Mammals first appeared

Explanation:

The dinosaurs became extinct one million years after the Cenozoic era started. The mammals first appeared as the modern culture first appeared in that era.

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Roman numerals in an outline signify _____.

xxTIMURxx [149]

Im sure its main ideas

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3 years ago

What determines the rate carbon moves through biotic and abiotic factors

konstantin123 [22]

The carbon cycle describes the way the element carbon moves between the Earth's biosphere, hydrosphere, atmosphere, and geosphere. It is important for a few reasons: Carbon is an essential element for all life, so understanding how it moves helps us to understand biological processes and factors that influence them.

Source: Google
Hope this helps you :)

7 0

3 years ago

In Drosophila, the genes for body coloration and eye size are on different chromosomes. Normal-colored bodies are dominant to eb

Yuri [45]

Answer:

225 flies

Explanation:

Let gene for body colour : A

Let gene for eye type : B

Parent 1 : normal body and normal eyes = AABB

Parent 2: ebony body and eyeless = aabb

F1 : AABB X aabb = AaBb ( all have normal body and normal eye )

F1 progeny is self crossed given that the two genes are on different chromosomes which means they show independent assortment:

AaBb X AaBb =

A_B_ = normal body, normal eyes = 9

aaB_ = ebony body, normal eyes = 3

A_bb = normal body, eyeless = 3

aabb = ebony body, eyeless = 1

Hence the ratio is 9 : 3 : 3 : 1

Out of the 400 flies:

(9/16) * 400 = 225 flies have normal body colour and normal eyes

7 0

3 years ago

Genetic drift _____.

Sergeeva-Olga [200]

Genetic drift happens when well-adapted organisms survive and reproduce more often than poorly-adapted organisms. <span>The statement that best sums up evolution is the change in a population through genetic variation over time. Natural selection may be through (1) differential reproduction, that is, not all organisms are able to reproduce to their fullest capacity because nature cannot simply sustain it and (2) acquire genes, that is heredity.</span>

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3 years ago

A population of 288 cichlids lives in a lake with ample food, oxygen, and shelter. Over the course of one year, 375 new cichlids

zimovet [89]

Answer:588

Explanation:

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3 years ago