Would you expect an ecosystem that had not been disturbed for 20 years to remain the same? Explain why or why not.

Many organs are involved in the processes of keeping the blood and the body clean. when poisonous or harmful substances are in the blood, they are absorbed by the and released in a less harmful form. when wastes are present in the blood, they are filtered out and removed from the body by the

Explain why phospholipid molecules form a bilayer. (3 marks)

Discuss the functions of epithelial connective nerviud and muscular tissues