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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 ...

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 occ...

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 ...

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 oxygenate...

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...