Which of these describes a population?

a.
all the organisms that interact in a lake

b.
all the gray squirrels that live in a forest

c.
an area characterized by a group of plants and animals

d.

a nonliving factor in an organism’s environment

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.