Q: In a healthy forest, dead trees and limbs fall to the ground and decompose. Which of these statements best describes why decomposition is important to a forest ecosystem? OPTIONS:
- Nutrients are released when wood is broken down.
- Worms produce oxygen used by other organisms.
- Dead trees provide nest sites for many different species of birds.
- Water is stored in dead trees and limbs.
A: Nutrients are released when wood is broken down.

A research team wanted to produce a smaller variety of German shepherd dogs. They mated the smallest dogs from different litters for several generations. This is an example of which concept?
OPTIONS:
- extinction
- mutation
- selective breeding
- natural selection

selective breeding

Q: What is a galaxy? ---- OPTIONS:
- a moon that orbits a planet
- a planet that orbits the Sun
- a very large system of stars that is held together by gravity
- a very large system of planets that is held together by the Sun

A: a very large system of stars that is held together by gravity

The complete removal of decomposers from an ecosystem will have the greatest effect on which of the following?
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OPTIONS:
- the spread of disease
- the availability of water
- the recycling of nutrients
- the distribution of organisms

the recycling of nutrients

Question:
Young frogs do not resemble adult frogs. Which term is given to this pattern of development in frogs?
OPTIONS:
- asexual reproduction
- cloning
- metamorphosis
- biological adaptation
Answer:
metamorphosis

Question:
Which statement describes a method of sexual reproduction that occurs in plants?
OPTIONS:
- Stem cuttings are placed in water and grow roots.
- Seeds are produced from the flower of the plant.
- Underground stems from a plant grow into new plants.
- A leaf falls to the soil, develops roots, and grows.
Answer:
Seeds are produced from the flower of the plant.