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jeyben [28]
3 years ago
12

Two quick multiple choice biology questions! (For a couple extra points) ANSWER BOTH SERIOUSLY OR YOUR ANSWER WILL BE REMOVED

Biology
1 answer:
monitta3 years ago
5 0
 Short answer is: D and A :) If you need an explanation, tell me and i will be happy to explain 
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What is the basis on which the subdivisions in a Geological time scale are made
Andru [333]
 <span>The geologic time scale is divided into periods, which are then divided into epochs, which are further divided into ages. For example, the time of the dinosaurs lasted 3 periods (Triassic, Jurassic, Cretaceous), each period had 3 epochs (late, early, middle), and each age fit into one of those. Many epochs have more than 1 age associated with them. 
As for the basis for differentiating the eras, I'm not so sure. The only one I can say for sure is the end of the Cretaceous, which is when the dinosaurs suddenly became extinct due to a meteor impact. I think the divisions are based on significant, global-scale events that changed the world.

Sorry its so long but that the answer i think >:) ur welcome

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3 years ago
What are benefits of using tissue cultures to study medications used for treating cancer cells
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Answer: Medication can be tested on the cancer culture before being injected into the patient.

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3 years ago
Which molecule is responsible for the wide diversity of life on earth?
Elden [556K]
A phylogeny is an evolutionary ”tree” of related
organisms that can be constructed by using
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5 0
4 years ago
Select the correct answer. Which statement correctly explains the polarity of the water molecule? A. The hydrogen end of the mol
Nuetrik [128]

Answer:

option B) The oxygen end of the molecule has a partial negative charge and the hydrogen end has a partial positive charge.

Justification:

The electronegativity of an element accounts for its relative ability to attract electrons.

Being oxygen more electronegative than hdyrogen (the electronegativity of oxygen is 3.44 while the electronegativity of the hydrogen is 2.20), the electron density will be displaced toward the oxygen, letting it with a partial negative charge and the hydrogen with a partial positive charge.

Finally, since the charge is not symmetrical distributed around a center of the molecule, the molecule ends being polar.

7 0
2 years ago
What characteristic of are found in veins but not arteries?
Paul [167]

Answer: Possession of Valves

Explanation: Veins possess valves which ensures that blood flows in only one direction. Valves helps blood to flow back to the heart against gravitational force.

Arteries don't have valves because the pressure originating from the heart is capable of causing the blood to flow in one direction.

7 0
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