Logic of a solution: *Fertilization occurs when a sperm and an egg fuse to form a diploid zygote. Sexual reproduction requires formation of gametes, followed by fertilization. Sexual reproduction involves a sperm and egg fusing to form a diploid zygote.*
*(D)*
The original question: *What involves a sperm and egg fusing to form a diploid zygote?
Options:
- (A) Leptospirosis
- (B) produce offspring
- (C) allow growth
- (D) sexual reproduction
- (E) metabolic reaction
- (F) peachleaf willow
- (G) rapid expansion
- (H) Plant reproduction*

Logic of a solution: *Mutations may change the structure of a chromosome or just change a single nucleotide. Mutations are changes in genetic information. Alterations in genetic information may change the structure of a chromosome or just a single nucleotide.*
*(G)*
The original question: *Alterations in genetic information may change a chromosome's structure or one
Options:
- (A) nitrogen
- (B) harm them
- (C) Plants growth
- (D) Damages them
- (E) spectrum
- (F) nuclear waste
- (G) nucelotide
- (H) nitrate*

Logic of a solution: *Sponges are a source of food for many species of fish. Fish and other marine animals abound here. Sponges are a source of food for many marine animals.*
*(C)*
The original question:
*Marine animals find these to be a great source of food:
Options:
- (A) grain
- (B) nutrient
- (C) sponges
- (D) Energy.
- (E) sea vents
- (F) sodium
- (G) Energy
- (H) fungi*