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What is an Endocrine Gland?

An endocrine gland is a set of cells that secrete hormones directly into the blood. An example would be the pituitary gland. Another type of gland is an exocrine gland but these use ducts to secrete substanc...
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Answered by Ellie T. • Biology tutor
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How are plant cells adapted for photosynthsis

Plant cells have a thick waxy cuticle which is transparent to allow sunlight to pass through and it also minimises water loss. There are air spaces in the spongy mesophyll which allows gas exchange to occur ...
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Answered by Adiba M. • Biology tutor
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What are the differences and similarities between eukaryotic and prokaryotic cells?

There are two types of cell called Eukaryotic cells and Prokaryotic cells. Eukaryotes are organisms made up of eukaryotic cells which include animals, plants and fungi (you can remember this as YOU are a EU-...
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Answered by Alice F. • Biology tutor
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Describe the functional importance of the heart as a pump

The heart made up of four chambers; two atria at the top and two ventricles at the bottom. There are effectively two pumps. The pump on the right side of the heart sends blood to the lungs to be oxygenated. ...
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Answered by Emily W. • Biology tutor
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Explain how the trunk of an elephant evolved using Darwin's theory of natural selection, and then Lamarck's theory.

According to Darwin's theory, genetic variation within the population means that some elephants are born with longer noses. Longer noses are better suited to the environment, so longer-nosed elephants are mo...
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Answered by Katie P. • Biology tutor
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