Agood model of the cell membrane would be

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?

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

Depending on the organism the number of in a cell may change