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

a. red blood cells

b. tears

c. mucus

d. skin

What liver secretion is responsible for the emulsification of lipids in the duodenum?

Which body system is affected if the body has pneumonia, fluid in the lungs, and shortness of breath? * A•Respiratory system B•Circulatory system C•Muscular system D•Nervous system

Why is it necessary to have a membrane around the cytoplasm

The most likely explanation for showing fewer organisms at each feeding level going up the pyrmaid is that

How do organisms remain highly organized in spite of the universal tendency toward entropy

Name three geological processes that have shaped the earth

In Mendel's Pea Plant Experiment, the color of the seed is an example of A. a trait B. recessive C. an allele

Determine what each letter represents in the Punnett square. Letters A and B represent the genotypes of the

Which group of animal has the greatet known species diversity?

What is happening to the chromosomes during anaphase? A). chromosomes are lined up in the middle of the cells B). chromosomes are dragged into the ends of the cells C). chromosomes become invisible D) chromosomes shorten and thicken