Which makes bacterial infections difficult to defeat?

O

A. Bacteria live in viruses.

O

B. Bacteria live outside of cells.

O

C. Macrophages work slowly.

o

D. Killer T cells must attack host cells.

3 Select the correct answer. Which of the following is an example of a solution? A. flour and water B. sand and water C. salt and water

Osteoporosis is a disease that affects the bones and leads to an increase in bone fractures. Osteoporosis is most likely to be affected by which cycle?

Which of the following best describes how a chemical reaction will proceed with an enzyme compared to without the enzyme?

Why are sawfish unique in their ability to perform parthenogenesis?

Scientists conduct experiments to collect evidence. Which of the following is the best definition of the word experiment as used by scientists? A. the formation of a hypothesis B. making a series of observations C.

You observe 4 cell samples under a microscope. Identify which one belongs to a plant. A. Sample 2 has mitochondria and chloroplasts, a cell wall and a large vacuole. B. Sample 3 has mitochondria and a nucleus but no cell wall. C.

A student uses a balance to determine the mass of a feather. Which is most likely to be correct? A 10grams, B 10meters, C 10liters, D 10milliliters

Why is it that two species cant occupy the same niche for an extended period of time

For each menu item at a fast food restaurant, fat content (in grams) and number of calories were recorded. A scatterplot of these data is given: Reference: Ref 4-3 A plausible value for the correlation between fat content and calories is A. + 0.2. B.

Geologists use radioactive dating for which of the following? (A). Identifying the relative ages of rock layers. (B). Determining the absolute ages of rocks. (C). Telling how radioactive substances is (D). Collecting evidence of fossils.