Ques and Ans: What is a basis for natural selection?
Options:
- (A) fur and fat
- (B) competition
- (C) mutation
- (D) root growth
- (E) insects
- (F) animals
- (G) trees
- (H) cows
(C)
Logic chain: Mutation creates new genetic variation in a gene pool. Genetic variation is the basis for natural selection. Mutation is a basis for natural selection.

Ques and Ans: What is a main component of a virus?
Options:
- (A) Something that causes allergies
- (B) Leptospirosis
- (C) Localized damage
- (D) heat produced
- (E) deoxyribonucleic acid
- (F) Chemical energy
- (G) direct damage to the lungs
- (H) It helps them survive
(E)
Logic chain: Viruses contain DNA but not much else. DNA DNA is deoxyribonucleic acid. Viruses contain deosyribonucleic acid, but not much else.

Ques and Ans: Petals attract animals such as bees to what part of a producer?
Options:
- (A) orchids
- (B) stem
- (C) buds
- (D) flowers
- (E) seeds
- (F) plants
- (G) vegetation
- (H) leaves
(D)
Logic chain: Petals attract pollinators to the flower. Kiwifruit flowers are pollinated by bees. Petals attract bees to flowers.

Ques and Ans: What are single celled organisms that do not have a nucleus?
Options:
- (A) Most plants
- (B) nucleus
- (C) ferns
- (D) fossil fuels
- (E) bushes
- (F) Eukaryotes
- (G) leech
- (H) bacteria
(H)
Logic chain:
Prokaryotes are single-celled organisms that lack a nucleus. Prokaryotes are usually microscopic and bacteria is an example of a prokaryote. Bacteria are single celled organisms that do not have a nucleus.