1. Organisms that cannot make their own food and must obtain energy from external sources are called (a) Autotrophs
(b)Heterotrophs
(c) Thylakoids
(d)Plants

What happens when the cell copies its chromosomes

If bacteria are much too small to see, what is one reason why can we see colonies in the petri dishes that have plenty of food to eat after only a few days?

Apopulation of black bears depends on salmon from a stream for food. if a drought causes the stream to run dry one year, how will this likely impact the black bear population?