19. much like a cell, a virus is able to a. respond to its environment. b. obtain and use energy. c. change over time. d. grow and develop.

The health, management and conservation of biodiversity, is a challenge facing ecosystems worldwide. the major factors that affect the health and function of the great barrier reef are climate change and pollution. which question investigates the effects of a biotic factor on the reef ecosystem?

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

Which direction does the energy flow in this energy pyramid ?