Which structures 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

Which of the following best defined weather: 1 - events that happen over a long period of time 2 - a seasonal pattern of events in the hydrosphere 3 - the atmospheric conditions at a particular time 4 - a measure of kinetic in the atmosphere

The water at the top of the water fall has ___ energy a. Potential b. kinetic c. heat d. Metabolic

What does the "mRNA destroyer" do?

Blood groups are based on: A) the presence of inherited antigens on the surfaces of leukocytes and other nucleated cells. B) the presence of inherited antigens on the surfaces of erythrocytes. C) the presence of inherited circulating antibodies.

What hypotheses have been proposed to explain how prions evolve? Select the TWO answers that are correct. a.

Which fossil few originates from the organic matter made of did marine organisms?

The allele for a widow's peak has complete dominance over the allele for a straight hairline (w). What is the probability of a man with a straight hairline (ww) and a woman with a widow's peak (WW) having an offspring without a widow's peak?

How conjugation differs from the binary fission?

Which biome has no large trees because much of the soil is frozen?

The primary bronchi enter the lungs at an area called the