A bird population of 16,000 experienced 2,000 births and 500 deaths in a year. What was the bird population's growth rate for that year?

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Solutions to environmental problems in europe must