All lining and covering membranes consist of

1. an epithelium only.

2. epithelium and connective tissue.

3. an epithelium, a connective tissue, and smooth muscle.

4. a serosa.

Which of the following is a healthy blood pressure level? A. 120/95 B. 130/80 C. 110/75 D. 115/85

Brian's eighth grade biology class is conducting a scientific investigation to find out what types of rock the school is built on. The class goes out to collect rocks from an exposure at the edge of the school property.

Does the visible color of a leaf indicate the relative amounts of the pigments within the leaf?

Adaptation, Natural Selection, and Evolution Question?!

What environmental factors could explain differences between breath holding and a "dive"?

In industrialized nations, childhood diseases have declined dramatically during the past half-century, largely as a result of

How does normal gene expression differ from epigenetic effects on the genome?

Why is a virus considered to be nonliving (info provided in text of reading) ?

Some clients are excessively responsive to either the primary or secondary effects of a drug. This is known as hypersensitivity, and it may result from a pathological or underlying condition.

Is a chameleon a lizard?