Oxygen accounts for about of the air in the atmosphere. A: 82%

B: 5%

C: 66%

D: 53%

E: 21%

Cassandra made a venn diagram to compare and contrast the two stages of cellular respiration. which belongs in the area marked x? energy is released. oxygen is used up. glucose is broken down. carbon dioxide is used up.

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes

Matched chromosomes carrying information about the same characteristics in the organism are called