Which of these is an abiotic factor of an aquarium ecosystem?
a.
algae growing on the glass
b.
gravel on the bottom of the aquarium
c.
plants growing from the gravel
d.
fish swimming in the water

Food webs - transferring energy and matter from one level to another. here you see four food webs. one or more are incorrect. which food web(s) show the correct sequence of organisms, from start to top level consumer? a) a b) d c) c d) a and d

Drag the tiles to the correct boxes to complete the pairs. match the nitrogenous base of dna with its complement.

Which of the following is a good definition for the word adaptation? question 1 options: a trait that an organism survive and reproduce in its environment. a change in an organism's environment. the way in which animals obtain food. a temperature change that can cause the extinction of plants and animals.