Line 1: *Mutations that lead to cancer usually occur in genes that control the cell cycle. Mitosis is part of the cell cycle. Mutations that lead to cancer usually occur in genes aiding in mitosis.*
*(G)*
Line 2: *Mutations that lead to cancer usually effect genes that aid in what?
Options:
- (A) illness
- (B) health
- (C) disease
- (D) blood transfer
- (E) chemotherapy
- (F) respiraration
- (G) mitosis
- (H) recovery*

Logic of a solution: *Some viruses live in a dormant state inside the body. When ferns are dormant it is as if they are hibernating. Some viruses live in a hibernating state inside the body.*
*(E)*
The original question: *What can stay hidden in a hibernating state inside the body?
Options:
- (A) infections
- (B) blood cells
- (C) fungi
- (D) insects
- (E) viruses
- (F) honeybees
- (G) plasma
- (H) barnacles*

Line 1: *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.*
*(F)*
Line 2: *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*

Logic of a solution: *Chordates have a complete digestive system and a closed circulatory system. Vertebrates have a closed circulatory system. Chordates are vertebrates.*
*(F)*
The original question: *What group of animals do chordates belong to?
Options:
- (A) graptolites
- (B) more abundant
- (C) warm-blooded
- (D) four limbs
- (E) epidermal
- (F) Vertebrates
- (G) animals
- (H) insects*

Line 1: *Echinoderms lack respiratory and excretory systems. Lung mechanics and gas exchange are topics during study of the respiratory system. Echinoderms have no lungs.*
*(A)*
Line 2: *What do echinoderms lack?
Options:
- (A) Lungs
- (B) Mass
- (C) oxygen
- (D) eardrum
- (E) gills
- (F) ovaries
- (G) Organs
- (H) Bodies*

Line 1: *Earthworms are important deposit feeders that help form and enrich soil. Earthworms by Casey Earthworms are invertebrates. Invertebrates can be deposit feeders.*
*(D)*
Line 2:
*Invertebrates can be what?
Options:
- (A) people
- (B) scarce resources
- (C) vertebrates
- (D) deposit feeders
- (E) Catch prey
- (F) major threat to health
- (G) more abundant
- (H) planets*