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Biology
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What does the nervous system consist of and what does it do?

Your nervous system is divided into two parts:

- The central nervous system (CNS) which is made up of the brain and the spinal c...

AA
Answered by Appitha A. Biology tutor
7087 Views

Describe the electrical activity of the heart.

The heart is known as myogenic and can beat of its own accord, and this is tightly controlled to ensure the optimum blood flow through the heart to deliver oxygen to the rest of the body. 

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BB
Answered by Ben B. Biology tutor
7296 Views

Why are drug trials needed?

To determine the side effects of taking the drug on humans, to test for toxicity, to determine the correct dosage needed, and to test the effectiveness (efficacy) of the drug.

DP
Answered by Devna P. Biology tutor
3328 Views

What is the difference between a recessive and dominant allele?

Alleles are different versions of a gene. Every person has two alleles for each gene (one from either parent). For example, the gene which determines eye colour can either have an allele ...

EJ
Answered by Elisha J. Biology tutor
11654 Views

How could species have evolved from an ancestor such as Archaeopteryx?

When the population of a species is separated, each group is put under different selection pressures due to differing environments. In each population there is genetic variation, and more offspring are...

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Answered by Heather J. Biology tutor
8021 Views

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