Kate bought 3 CDs and 1 used DVD at the bookstore. Her. friend Joel bout 2 CDs and 2 used DVDs

Why climate is changing? What are the causes of change?

The strategy of vaccination to fight diseases uses what type of immunity? A. Non-specific immunity B. Cell-mediated immunity C. Natural immunity D. Specific immunity E. Passive immunity

What is mutation? What causes a mutation?

Groups of cells working together to complete a specific function.

Which compound of earth's atmosphere is decreased due to photosynthesis A. Ozone B. oxygen C. hydrogen peroxide D. carbon dioxide

Describe how the population of the Earth increase if the number of children being born is less?

What is defined as all of the living and non-living components of a particular geographic area?

Most reptiles and all birds are, meaning that their young develop in fertilized eggs laid outside the mother's body. in contrast, most mammals are, meaning that their young develop inside the mother's body.

What is heamoglobin

In the following experiment, what is the independent variable? Dr. Honeydew would like to test the effect of chlorine on Beaker's hair color. To test this he pours heavily chlorinated pool water on the right side of Beakers head.