When does a comet's bright tail appear?

a.

when it nears the moon

b.

when it nears another comet

c.

when it collides with a planet

d.

when it nears the sun

How is gravity affected when the distance between objects decreases?

Name the part of brain responsible for controlling each activity

Name the class of nutrients that consists of triglycerides phospholipids and sterols

Explain how wolves can be used as a biological indicator of the overall health of the ecosystem?

2. What happens to the total population when the birth rate is at 40 and the death rate is at 15? Increasing moderately decreasing moderately increasing significantly decreasing significantly

Which factors affect a rivers load

Which sentence best captures a central idea of the biography

Is a fossil still a fossil if it is preserved artificially? For example, (Is a mummy a fossil even though it was preserved by people?)

Which type of macromolecule is the quickest source of energy for the body

Which two structures contain DNA