Why do biologists consider procaryotes important? (more than one answer can be correct.)
a. they constitute most of the biomass on earth
b. they perform essential transformations of materials on which all other life depends
c. they are biochemically far less diverse than eucaryotes
d. they are the most numerous organisms on earth

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.