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Describe the process of evolution by natural selection as developed by Charles Darwin in the 1800s.

Evolution by natural selection occurs when random mutations in the genome of an organism causes phenotypic traits (observable characteristics or traits) to be different between individuals of an organism. Th...
JW
Answered by Jack W. • Biology tutor
4021 Views

Describe and explain the role of inspiratory and expiratory muscles during normal breathing

The main muscle of normal quiet breathing is the diaphragmDuring Inspiration, it contracts which causes it to flatten. This increases the volume of the thoracic cavity and so the pressure decreases. This all...
SD
Answered by Symran D. • Biology tutor
3095 Views

Describe how oxygen moves into the blood at the lungs.

Oxygen moves via diffusion from the alveoli in the lungs where there is a high concentration of oxygen, into the blood where there is a low concentration of oxygen - it moves down its concentration gradient.
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Answered by Isobel S. • Biology tutor
7909 Views

What should I do to get full marks in the essay section?

The essay section is split into 3 individual questions. These 3 questions will be worth 20 points altogether, out of which 2 points will be awarded for the quality of your writing, i.e. hand-writing, grammar...
LP
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Carbon from dead leaves is recycled through the carbon cycle. Explain how Carbon is recycled to new leaves.

Dead leaves fall from plants to the ground. These leaves contain carbon. They are digested by microorganisms like bacteria which take up carbon and then respire it into the atmosphere. Plants are autotrophs ...
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Answered by Ewa M. • Biology tutor
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