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What are the roles of the parasympathetic and sympathetic nervous systems?

The sympathetic nervous system and parasympathetic nervous systems are both part of the autonomic nervous system. They work together to achieve homeostasis. The sympathetic nervous system primarily activates...
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Answered by Ursula B. • Biology tutor
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Give three differences between the structures of RNA and DNA

DNA has a double helix structure, RNA is usually single-stranded DNA is stable, RNA is very unstable DNA is longer, RNA is generally shorter DNA contains Thymine, RNA contains Uracil DNA contains a deoxyribo...
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Answered by Shannon M. • Biology tutor
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Explain how a leaf is adapted for photosynethesis

A large surface area for gaseous exchangea waxy cuticle prevents water lossthe spongy mesophyll layer has air spaces which allow for efficient gasious exchange Stomata allow gases to enter and exit the leafg...
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Answered by Ellie M. • Biology tutor
3098 Views

State the cell theory and briefly describe 3 exceptions.

The cell theory states that:All living organisms are composed of cells (unicellular or multicellular)The cell is the smallest unit of lifeAll cells come from the division of pre-existing cellsExceptions:Skel...
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Answered by KYRIAKI P. • Biology tutor
7027 Views

Can you explain the difference between type I and type II diabetes?

Both types of diabetes are based around the hormone insulin. Insulin is produced by the pancreas when we have elevated levels of glucose in the blood, for example after eating a meal. Insulin binds to recept...
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Answered by Amy K. • Biology tutor
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