Question

Which of the following involves only biotic factors?

A. a pine tree absorbing light from the Sun
B. a spider building a web in the corner of a building
C. a duck catching and eating a snail
D. an otter using a stone to break open a sea urchin

Answer 1

a duck catching and eating a snail

Step-by-step explanation:

Answer 2

C- a duck catching and eating a snail

Step-by-step explanation:

Biotic factors involve living things. The only choice with two living beings interacts would be C.