What do comets and asteroids have in common?

What is the first step in a life cycle of a plant reproduce sexually

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?

Wich organism obtains its energy from dead or decaying matter