Question: Q: Where are protons and neutrons located? Choices: - outside the nucleus - secondary nucleus - orbitals - central nucleus A:
Answer: central nucleus

Question: Q: What is the only commercial way of reproducing plants such as orchids? Choices: - sexual reproduction - cross-breeding - grafting - cloning A:
Answer: cloning

Question: Q: What do sharks use to secrete salt to assist in osmoregulation? Choices: - ceramic gland - bladder gland - blood gland - rectal gland A:
Answer:
rectal gland