There are approximately 200 different types of cells in the human body, although all cells are dependent on other cells to perform body functions.

Which of the following are part of the body s first line of defense against pathogens? a. white blood cells b. red blood cells c. lymph nodes d. mucous membranes

A researcher determined the effect that the dosage of a certain pain medication has on headaches. How would the results best be displayed? A) pie chart. B) bar graph. C) line graph. D) data table.

Which feature below differentiates endocrine glands from exocrine glands? A. The location of the gland B. What the gland secretes its hormone into C. What organ or tissue is controlled by the gland's hormone D.

What happens when then the rabbits populations increased?

The National Weather Service has issued three tornado watches so far this month. is this an example of weather or climate? I've lived here for 10 years, and I've never seen the conditions so dry.

The age of the solar system is estimated by the dating of rocks. True or false

What are three of the excretory organs of the body

10. What is a major limiting biotic factor for animal succession in each stage? A) plant species B) sunlight
C) soil minerals D) vitamins

Which kind of energy comes from sources that won't run out?

A scientist presents the findings from her latest research at a scientific conference. Several scientists in the audience question her analysis. Which of the following is the best response to the criticism? A.