How could research on how genes control traits on orchids benefit our understanding of the human genome

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled

What’s a example of extrusive rock that cooled to quickly for grains to form

What is the next step in muscle contraction after the actin changes shape