Q: How many valence electrons does carbon have? Choices: - one - five - two - four A:
four

Q: What is the largest organelle in a eukaryotic cell? Choices: - ribosome - vacuole - mitochondria - nucleus A:
nucleus

Q: Q: Isotopes are named for their number of ______ plus neutrons? Choices: - electrons - atoms - nuclei - protons A:
A: protons

Question: Q: Where do most skin structures originate in? Choices: - epidermis - cuticle - hypodermis - dermis A:
Answer: dermis

*Question*
Q: What process refers to the changes that occur in populations of living organisms over time? Choices: - spontaneous mutation - adaptation - variation - evolution A:
**Answer**
evolution

(Question)
Q: Water is a versatile solvent that can dissolve many ionic and polar molecular solutes to make what? Choices: - chloride solutions - sulfate solutions - sulfide solutions - aqueous solutions A:
(Answer)
aqueous solutions