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Which layer of the atmosphere contains the most water vapor?
Troposphere
Which is the most likely cause of tropical storms?
Warm water evaporates, rises quickly, and interacts with a colder air mass.
Over a period of several hours, a barometer shows rapidly decreasing air pressure. What type of weather will most likely occur next?
calm, windless weather
What causes convection currents to occur on Earth?
warm air rising, cool air sinking
Why are scientists concerned with ozone depletion in the upper atmosphere?
because it allows ultraviolet radiation to reach Earth's surface
How does the arrangement of the air molecules found in the troposphere compare to the arrangement of those found in the thermosphere?
The air molecules are closer together in the troposphere and are farther apart in the thermosphere.
Why do thunderstorms most often occur in the summer months?
Higher temperatures increase the rate of evaporation and convection.
What type of weather is most likely observed in an area when cirrus clouds are present?
calm weather
Earth's atmosphere is mainly composed of which gases?
nitrogen, oxygen, argon, and carbon dioxide
In which way are a euglena and a volvox different?
A euglena is an individual cell, while a volvox is a colony of cells.
Which function does the nucleus of a cell perform?
It controls the activity of the cell.
Which best explains why muscle is considered a tissue?
It is a group of cells working together.
What is one way the respiratory system and the circulatory system work together in the human body?
The respiratory system takes in oxygen, and the circulatory system delivers the oxygen to the cells of the body.
How do a volvox and an amoeba get their food?
A volvox uses photosynthesis, and an amoeba surrounds its food.
Which statement describes the organization of living organisms?
All organisms are composed of one or more cells, which are the basic units of structure and perform essential life functions.
How do the digestive system and the circulatory system work together in the human body?
The digestive system extracts nutrients from food, while the circulatory system transports those nutrients.
