How are eras and periods related?

A fast-flowing river of air that forms when two air masses of very different temperatures meet is called a A) el Niño. B) jet stream. C) trade wind. D) sea breeze.

What is weather? A. What's happening in space at a time and place B. What's happening in our atmosphere at a time and place C. The average weather over many years D. The average temperature over many years

If a cell is in a hypertonic solution, which statement is true about water movement and the cell? 1) Water only enters the cell. 2) More water leaves the cell than enters the cell. 3) More water enters the cell than leaves the cell.

Sea turtles, dolphins, and whales all live in the ocean. How do the respiratory systems of these three types of animals limit their behavior? A. They must eat very small pieces of food, because larger pieces would clog their respiratory tracts. B.

Diffusion is the spontaneous movement of a substance from an area of what

The allele for cystic fibrosis is recessive. What does this mean?

Which of the following statements is true? The Milky Way Galaxy is the only galaxy in the universe. The earth is always the same distance away from the sun. Bode's law correctly predicted the location of Neptune.

In most medical procedures, hazardous waste is produced. This waste is usually burned, which can release chemicals like mercury into the air. How could technology be best used to solve this problem?

Primitive anaerobic prokaryotic cells did not contain which of the following? A) mitochondria B) DNA C) cell membranes D) RNA

Which of the following is most important in forming ATP? A. sulfur B. helium C. phosphorus D. boron