the first answer as blood needs to be oxygenated to be passes round the body then when its deoxgenated it will return to the heart to be pumped around the body again
Genetic variation. C is the answer
C. Changes to biodiversity can positively and negatively affect an ecosystem.
Answer:
Acids and base indicators help us identify whether a substance is acidic or basic . They can be used to detect the nature of soil , samples etc which can be helpful.
Answer:
In cells, the hydrolysis of adenosine triphosphate (ATP) is the immediate source of energy for an endergonic reaction.
