When a certain plant is without water for an extended period of time, guard cells close openings in the leaves of the plant, conserving water. What does this illustrate?

Moss often grows on trees. the tree is not affected, while the moss has the nutrients it needs to grow. what type of relationship is this

Name three groups of plastic sedimentary rocks

What are some possible factors that must remain constant during testing

An organism that can live in only one particular environment or that can survive on only one type of food would be called a?

What are some of the specialized cells found in vertebrate animals

Which of the below is TRUE regarding desertification? a. It is likely to happen in any type of climate b. It produces rich desert ecosystems c. It is not usually impacted by droughts or climate change d.

What is considered a pre existing medical condition?

Humans do not eat the algae directly from the ocean, so how can we still be affected by it?

In an effort to control the ongoing cholera epidemic affecting Haiti, health officials are considering the use of cholera vaccines. One difficulty they are facing is the limited vaccine supply.

which term refers to the structure that forms the surface of a cell separeting its conctents from the outside world