When do animals cooperate with one another

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?

Anybody who knows ap biology, can you friend or message me

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry