Answer the following question given this paragraph: Roundworms have a tough covering of cuticle on the surface of their body. It prevents their body from expanding. This allows the buildup of fluid pressure in their partial body cavity. The fluid pressure adds stiffness to the body. This provides a counterforce for the contraction of muscles, allowing roundworms to move easily over surfaces. Q: Which body part helps roundworm prevent their body from expanding? Choices: - scales - plate - skin - tough cuticle covering A:
tough cuticle covering

Answer the following question given this paragraph: Evolution that occurs over a short period of time is known as microevolution . It might take place in just a couple of generations. This scale of evolution occurs at the level of the population. The Grants observed evolution at this scale in populations of Darwin's finches. Beak size in finch populations changed in just two years because of a serious drought. Q: Evolution that occurs over a short period of time is known as what? Choices: - short term evolution - pseudoevolution - relatedness - microevolution A:
microevolution

Answer the following question given this paragraph: The spinal cord is a long, tube-shaped bundle of neurons, protected by the vertebrae. It runs from the brain stem to the lower back. The main job of the spinal cord is to carry nerve impulses back and forth between the body and brain. The spinal cord is like a two-way highway. Messages about the body, both inside and out, pass through the spinal cord to the brain. Messages from the brain pass in the other direction through the spinal cord to tell the body what to do. Q: What is a long, tube-shaped bundle of neurons, protected by the vertebrae? Choices: - a ganglion - an axon - a dendrite - the spinal cord A:
the spinal cord

Answer the following question given this paragraph: 46.4 The interplay of tropic and sex hormones regulates mammalian reproduction. Q: What two types of hormones regulate mammalian reproduction? Choices: - tropic and subtropic - pheromones and enzymes - endorphins and adrenaline - tropic and sex A:
tropic and sex