Q: Q: Reptiles and birds are the only known living descendants of what? Choices: - mammals - fossils - dragons - dinosaurs A:
A: dinosaurs

Q: Q: What is the term for animals that have a backbone? Choices: - carnivores - invertebrates - herbivores - vertebrates A:
A: vertebrates

Q: Q: What is the outer layer of an axon that acts like a layer of insulation, similar to the plastic that encases an electrical cord? Choices: - lipids sheath - nerve sheath - layer sheath - myelin sheath A:
A: myelin sheath

Q: Q: The body does not exist in isolation. there is a constant input of water and electrolytes into the system. while osmoregulation is achieved across membranes within the body, excess electrolytes and wastes are transported to the kidneys and excreted, helping to maintain this? Choices: - physical balance - vacuum balance - nucleic balance - osmotic balance A:
A: osmotic balance