Algae are green plants. The figure below shows the number of algae in a lake in the United Kingdom during
one year
number of
algae
Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec
month
Explain the changes in the number of algae in the lake from February to June (3)

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?

Name the following: (a) category of pathogen that causes diseases, like common cold and mumps. (b) the microorganism that requires a host to produce.

9. the history of life on earth is recorded in