If the frequency of a wave decreases, what happens to velocity?

Ecosystems involve living organisms interacting with non-living things in a productive way; how is photosynthesis an example of this? answer, i will give brainiest to first person to get it right.

An organism has the following traits multicellular cant photosynthesize has a skull. wht kingdom does this organism most likely belong too?

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms