hi here is your answer hope it helps or then sry
Explanation:
the importance of oxygen for animals, researchers suspected that a sudden increase in the gas to near-modern levels in the ocean could have spurred the Cambrian explosion.
Answer:
A woody structure.
A single trunk.
The ability to grow tall.
The ability to increase in all dimensions.
Explanation:
The excretory system will help remove extra water and eliminate it as urine.
organisms that do aeriobic respiration
C6H12O6+6O2--->6CO2+6H20
Or in some cases fermemtative fungus(Saccharomyces cerevisae)
C6H12O6--->2CO2+2C2H5O
The clumping of blood, caused by hemoglobin