All of the following prevent pathogens from entering the human body except

a. red blood cells

b. tears

c. mucus

d. skin

What is the difference between an infectious disease and a noninfectious disease? a.) the length of the disease b.) the cause of the disease c.) whether the disease is fatal d.) the severity of the disease

What is a cell called that isn't a sex cell?

The radio waves have a frequency of 4.8 % 109 Hz Wave speed of electromagnetic waves = 3.0 x 108 m/s Calculate the wavelength of the radio waves. Give your answer to 2 significant figures.

A woman gives birth to a son who has type AB blood. She has type B blood. which of the following can be concluded from this about her parents blood type? A.) one of her parents had at least one B allele B.) one of her parents had type AB blood. C.

Name the class of nutrients of which sugars and startches belong

What does sodium-potassium pump do?

Which scientist disproved the ideas of spontaneous generation

Many fault lines are obvious at the surface. How can the epicenter of an earthquake be located miles away from the fault line?

The harmless scarlet kingsnake has scales in a coloration and pattern resembling the scales of the dangerous coral snake. The scarlet kingsnake is using to avoid predation

Charles Darwin came up with the system we use to name and classify organisms. True False