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SVEN [57.7K]
3 years ago
5

Which statement is an example of a scientific theory?

Biology
1 answer:
Alchen [17]3 years ago
6 0

Answer:

B

Explanation:

B is referring to cell theory, which basically states that all living things are made of cells and all cells come from other cells withe the exception of the first life forms.

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Why does DNA make a copy of itself during cell division?
Sonja [21]

Answer:

B. To make sure that the two new cells have slightly different genetic codes.

Explanation:

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3 years ago
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Leaves of green plants contain openings known as stomates, which are opened and closed by specialized cells allowing for gas exc
tamaranim1 [39]

Answer:

Carbon dioxide moves in; oxygen moves out

Explanation:

The pigment that offers the green pigmentation for green plants is known as Chlorophyll. On the surface of the leaves on green plants are microscopic openings known as Stomata in the epidermis of leaves. Stomata are generally more numerous on the underside of leaves. They provide for the exchange of gases between the outside air and the branched system of interconnecting air canals within the leaf.

On a sunny day, The concentration of carbon dioxide in the air is a regulator of stomata opening in many plants. The stomata opens (then  Carbon dioxide moves in and in-turn releases oxygen after photosynthetic activities has taken place) and closes in response to the internal pressure of two sausage-shaped guard cells that surround it. The inner wall of a guard cell is thicker than the outer wall.

The main function of these Guard cells  are to control excessive water loss, closing on hot, dry, or windy days and opening when conditions are more favourable for gas exchange.

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3 years ago
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The largest mass extinction event in the history the Earth occurred at the end of the ___ period. A. Cambrian B. Ordovician C. D
olga55 [171]
Hello! The largest mass extinction in Earth's history occurred about 250 million years ago, right before the dinosaurs appeared. Devonian Period ended about 355 million years ago, which was before the mass extinction occurred. Therefore, C is eliminated. The Cambrian Period came before Devonian Period, ending around 485 million years ago, which also eliminates A. Ordovician Period ended about 445 million years ago, which also before the mass extinction. B is gone, which leaves us to the last available answer choice being D. The Permian Period ended around 250 million years ago, which was the time of the mass extinction. The largest mass extinction even occurred at the end of the Permian period. The answer is D: Permian.
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3 years ago
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What is mimicry in biology
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Answer:

mimicry, in biology, phenomenon characterized by the superficial resemblance of two or more organisms that are not closely related taxonomically. This resemblance confers an advantage—such as protection from predation—upon one or both organisms by which the organisms deceive the animate agent of natural selection.

Explanation:

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Complimentary RNA sequence to ACATTTCAGACCGTC<br><br> HURRY
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Answer:

UGUAAAGUCUGGCAG

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In rna all codes that are copied from DNA are swap for their base pairs and T is replaces with U

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