ANSWER FOR BRAINLEST

What can scientists infer about the period of very early Earth from the lack of fossilized remains of oxygen breathing animals and the dominance algae?

A)everything was underwater
B)the atmosphere lacked oxygen
C)only fish lived during that time
D)the dinosaurs used all the oxygen

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid