Q: Although it is not vital to humans, calcitonin is important for calcium homeostasis in adults of some species in what group characterized by backbones? Choices: - mammals - reptiles - invertebrates - vertebrates A:
vertebrates

(Question)
Q: Panting allows dogs to get rid of what? Choices: - fur balls - accumulated toxins - calories - excess body heat A:
(Answer)
excess body heat

Ques: Q: When lactose is absent, a repressor protein binds to what? Choices: - differential - network - worker - operator A:
Ans: operator

(Q).
Q: Molecules of gas are rare in what outermost region of the planet's atmosphere? Choices: - ozone layer - thermosphere - ionosphere - exosphere A:
(A).
exosphere

Ques:Q: What occurs when individuals of different species strive for a limited resource in the same area? Choices: - vegetal competition - asexual competition - intraspecific competition - interspecific competition A:

Ans:interspecific competition

Question: Q: Although fewer in number than chemical synapses, what type of synapses are found in all nervous systems and play important and unique roles? Choices: - duplicating synapses - beginning synapses - dual synapses - electrical synapses A:
Answer:
electrical synapses