Question

1. choose the best answer. an organism that relies on external factors to maintain an internal temperature suitable for life. ectotherm heterotroph species endotherm 9) choose true or false. humans are endotherms. true false 10) choose the best answer. what percentage of air is oxygen? 15% 21% 10% 30%

Explanation:

• For question 8, ectotherms are organisms that rely on external heat sources to regulate their body - temperature. Heterotrophs are organisms that obtain energy by consuming other organisms, species is a taxonomic rank, and endotherms generate their own body heat internally.
• For question 9, humans are endotherms as they can maintain a relatively constant body - temperature through internal physiological processes.
• For question 10, by volume, approximately 21% of air is oxygen.

Answer:

1. A. ectotherm
2. A. True
3. B. 21%