Q: Q: Hormones, ions, and neurotransmitters are all types of what? Choices: - nutrients - pathogens - proteins - chemical signals A:
A: chemical signals

Q: Q: Free atoms are spherical in shape, so the relative sizes of the elements can be compared by looking at each atom's atomic what? Choices: - weight - axis - angles - radius A:
A: radius

Q: Q: Most of the chemical reactions in the body are facilitated by what? Choices: - proteins - vitamins - carbohydrates - enzymes A:
A: enzymes

Q: Q: Winds are caused by differences in what? Choices: - elevation - temperature - water pressure - air pressure A:
A: air pressure