Which statement represent an abiotic environmental factor in an ecosystem?
*the flower bud every spring .
*the fish swim up the river to reproduce.
*the fox eats meats in the meadow.
the lake bottom is lined with rocks,

The lake bottom is lined with rocks,

Explanation:

An ecosystem is a community of living beings where the living beings interact with their non-living physical environment. In an ecosystem the non-living physical environment includes the abiotic factors such as sunlight, water, soil, rocks and others.

The lake bottom is lined with rocks is the correct option this is because of the fact that rock is an abiotic or non-living factor.  

b. heterotroph

explanation:

the answer to your question is:

c. complementary base-pairing