Select all the correct answers. Which of the following organisms can have all of the energy it uses to move, grow, and survive traced back to radiant energy from the Sun?
a tree
a human
a flower
a bacterium
a fish

How many types of rock can form from the rock cycle

How does science influence the decisions made about social, economic, and political issues?

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