(Q).
Q: In which sphere of the atmosphere do the northern and southern lights occur? Choices: - lithosphere - stratosphere - ionosphere - thermosphere A:
(A).
thermosphere

(Q).
Q: Do amphibians and reptiles maintain a constant body temperature? Choices: - yes - no, they have a lower body temperature than their surroundings - no, they have a higher body temperature than their surroundings - no, they have about the same body temperature as their surroundings A:
(A).
no, they have about the same body temperature as their surroundings

(Q).
Q: Pepsin and trypsin are examples of enzymes involved in what bodily process? Choices: - filtration - regeneration - perspiration - digestion A:
(A).
digestion