So your teacher tells you to go to your backyard and tell her about the ecosystem, and population, if you have dogs is that a population?

Yes. they are living and living in the backyard so therefore they are considered part of the population of the backyard. You can also include any birds, squirrels, and any other animals that you see.

Hope This Helps!

its the cell wall and the they are unique to plant

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !