The correct answer is 20% on average. The ideal percentage rate of a healthy man with normal weight is 18 to 22%. However, a range of 7-13% is considered normal for male professional athletes, because their muscular mass is much greater. The physiological minimum rate which is acceptable for males is 4-6%.
Answer:
returns to the left heart, completing the pulmonary cycle
Explanation:
The answer is true you can find these things out by DNA abd chromosomes
The correct answer is: c. chordates are more closely related to echinoderms than to arthropods
The Closest nonchordate relatives to Chordates are Echinodermata. Hemichordates (such as acorn worms) and Echinodermata form the Ambulacraria which is the sister phylum of the Chordates.
Echinoderms and chordates are both deuterostomes, but the differences are that Echinoderm possess bilateral symmetry only as larvae, they have tube feet and their bodies are supported by calcite skeletons.
