[Q] Which needs fungi need to survive?
Options:
- (A) Energy
- (B) food
- (C) alveoli
- (D) oxygen
- (E) peat
- (F) bushes
- (G) bacteria
- (H) trees
[A] Here's my solution: Oxygen is essential for cellular respiration for all aerobic organisms. Fungi are aerobic organisms. Oxygen is essential for fungi cellular respiration. The answer is (D).

[Q] What continues to grow throughout their lives?
Options:
- (A) potatoes
- (B) Hemoglobin
- (C) tortoises
- (D) plastic roses.
- (E) Human teeth.
- (F) Lilies.
- (G) Silk daisies.
- (H) vegetation
[A] Here's my solution: Most plants continue to grow throughout their lives. Lilies continually produce new bulbs, from which grow new plants. Lilies continue to grow throughout their lives. The answer is (F).

[Q] What increases the stability of ecosystems?
Options:
- (A) overpopulation
- (B) water consumption
- (C) loose soil
- (D) Quality of life
- (E) agriculture
- (F) deforestation
- (G) ecotourism
- (H) trees
[A] Here's my solution: Biodiversity increases the productivity and stability of ecosystems. Ecotourism, on the other hand, can help to conserve biodiversity. Ecotourism increases the stability of ecosystems. The answer is (G).

[Q] When gardening what can be depleted of nutrients?
Options:
- (A) fertilizer
- (B) bacteria
- (C) the plant
- (D) coal
- (E) pine
- (F) the dirt
- (G) Acids
- (H) water
[A]
Here's my solution: Soil can be depleted of nutrients. Dirt is really misplaced soil. Dirt can be depleted of nutrients. The answer is (F).