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This answer is best supported with a whiteboardAll living things need nitrogen, but nitrogen gas is too unreactive for plants and animals to use directly. Bacteria's main role in the nitrogen cyc...

Vaccinations involve introducing a small amount of dead or inactive form of a pathogen into the body. This stimulates white blood cells to produce complementary antibodies to destroy the pathogen. This is...

Capillaries deliver blood to individual cells in the body, supplying them with oxygen and nutrients ...

Think about the extreme conditions found in desertsHot temperaturesLack of water for long periods of timeVulnerable to animals
Think about the characteristics of these plants:Small leavesSpikesLarge ...

Think about what carbon is used for, and also what plants are required for.
Plants take in carbon dioxide from their surroundings, which enables them to undergo photosynthesis. At night, plants respi...