With regard to food, medicine, and human health, what are some positive and negative effects of biotechnology and genetic engineering?
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Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?

Which of th following is needed for cellular respiration to occur

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems