Food chains always begin with what type of organism? Why?

Some plants rely on the wind to reproduce an example is it’s important for plants to use the forces of nature to reproduce because 1. 1a white tuft of dandelion seeds 2a spiked burrs surrounding seeds 3a hard shell on a walnut? 2. 1b require pollination to reproduce 2b reproduce only asexually 3b cannot move about freely?

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?