All the things in an experiment that must be the same to make it fair are called

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?

How many cells are our body made of ? ♡

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins