Q: When bedrock in Massachusetts is examined, it often appears scraped and polished. Which of the following most likely caused the bedrock to appear scraped and polished? OPTIONS:
- crustal deformation
- frequent earthquakes
- glacial movement
- volcanic eruptions
A: glacial movement

Many cells have a nucleus that contains chromosomes. These chromosomes carry genes that are composed of
OPTIONS:
- hormones
- DNA molecules
- minerals and water
- undigested food molecules

DNA molecules

Q: Because sulfur cannot be decomposed by simple chemical methods into two or more different substances, it is classified as ---- OPTIONS:
- an element.
- a compound.
- a mixture.
- a molecule.

A: an element.

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.

Nutrients are released when wood is broken down.

Question:
The Moon orbits Earth at a speed of approximately one kilometer per second. The Moon is kept in orbit by which of the following?
OPTIONS:
- gravity
- lunar phases
- magnetism
- ocean tides
Answer:
gravity

[Q]: Living things are classified as producers or consumers according to
===
OPTIONS:
- their speed of movement
- the size of their communities
- how they obtain food
- how they reproduce
****
[A]:
how they obtain food