q: What can slowly dissolve carbon in sedimentary rock?
Options:
- (A) hydrocarbons
- (B) acetic acid
- (C) precipitation
- (D) evaporation
- (E) rivers and streams
- (F) puddles
- (G) ponds
- (H) nitrogen
a: (E)... Explanation: Flowing water can slowly dissolve carbon in sedimentary rock. Rivers and streams are bodies of fresh, flowing water. Rivers and streams can slowly dissolve carbon in sedimentary rock. That's why the answer is (E).

q: What is it called when one solvent combines with another, what forms?
Options:
- (A) chemical pair
- (B) permineralization
- (C) chemical bonds
- (D) a solute
- (E) chemical duo
- (F) substance bonds
- (G) Condensation
- (H) kinetic energy
a: (C)... Explanation: Chemical bonds form when substances react with one another. Solvents are substances, usually liquid, that dissolve other substances. When one solvent reacts with another, chemical bonds form. That's why the answer is (C).

q: Urine is a product of what organ of the body that is excreted by the urinary system?
Options:
- (A) bowel
- (B) epidermal
- (C) bladder
- (D) alveoli
- (E) lungs
- (F) urine
- (G) mammals
- (H) NaCl
a: (C)... Explanation: Urine is the liquid waste product of the body that is excreted by the urinary system. Liquid waste is put into the bladder. Urine is the waste product in the bladder that is excreted by the urinary system. That's why the answer is (C).

q: The two-chambered heart of some backboned aquatic animals is part of their:
Options:
- (A) aerobic capacity
- (B) three-chambered heart
- (C) biological diversity
- (D) it keeps an organism warm
- (E) the body's largest organ
- (F) circulatory system
- (G) salmon
- (H) swimming system
a:
(F)... Explanation: Fish have a circulatory system with a two-chambered heart. Fish are backboned aquatic animals. Some backboned aquatic animals have a circulatory system with a two-chambered heart. That's why the answer is (F).