Solution idea: Organisms cluster around hydrothermal vents in the ocean floor. Hydrothermal vents are fissures in the ocean floor that leak hot, acidic water. Organisms cluster around fissures in the ocean floor that leak hot, acidic water.
Q: Where do organisms cluster on the ocean floor?
Options:
- (A) neutralized water
- (B) where they used to live
- (C) hot alkaline water
- (D) fissures of hot, acidic water
- (E) sedimentary rocks
- (F) fissures blasting cold water
- (G) at or near the margins
- (H) an area swollen with pus
A: (D)

Solution idea: Meiosis is the type of cell division that produces gametes. Gametes are haploid egg or sperm that fuse to form a zygote. Meiosis is the type of cell division that produces haploid cells.
Q: Meiosis is the type of cell division that produces:
Options:
- (A) animals
- (B) Plant reproduction
- (C) Most plants
- (D) peachleaf willow
- (E) Plants growth
- (F) haploid cells
- (G) spread flower seeds
- (H) rapid expansion
A: (F)

Solution idea: Excretion is the process of removing wastes and excess water from the body. Ketones are exhaled and excreted in urine. Urination is a process of removing wastes and excess water from the body.
Q: What is a process of removing wastes and excess water from the body?
Options:
- (A) hydration
- (B) urination
- (C) incontinence
- (D) trash can
- (E) vaporization
- (F) Cooking
- (G) body waste
- (H) Exfoliation
A: (B)

Solution idea: Air pollution harms the respiratory and circulatory systems. Cars are a significant source of air pollution. Cars harm the respiratory and circulatory systems.
Q: What harms the respiratory and circulatory systems?
Options:
- (A) oil
- (B) rain
- (C) sulfur
- (D) cars
- (E) tires
- (F) coal
- (G) tar
- (H) bicycles
A: (D)