Why are nitrogen-fixing bacteria so important to other organisms?

When a person is not feeling well a doctor may examine samples of the person's blood to see how many white blood cells are present why would this information be useful?

Which statement best describes the plasma membrane of a living plant cell? A It controls which substances enter and exit the cell. B It is multi-layered and composed of only proteins and carbohydrates.

Kostmann syndrome is a severe congenital neutropenia. Which disorder/infection is characteristic of this condition?

Define polygenic and pleiotropic traits and explain their significance for researchers' efforts to link human genotypes to phenotypes.

Scientific conferences are important for sharing new scientific findings. True False

Why does it take a long time to develop a new variety of tomato? A. Changes in traits happen gradually, over many generations. B. Many plants resist change. C. Tomatoes cannot acquire new traits. D. A species cannot change over time.

Select the one true statement. Vacuoles store nutrients, water, and waste in animal cells. Plant cells can have chloroplasts but do not have a cell wall.

Using water more effectively A. Protects the environment B. Causes the loss of natural pollution filters C. Increases with contamination D. All of the above

2. The name given to energy stored in food is A. glycolysis. B. a matrix. C. a calorie. D. fermentation.

How are capillaries involved in gas exchange