Exit What is an important characteristic of the plant cell wall? A. It is fluid. B. It is rigid. C. It is alive. D. It stretches.

In 1630 at the beginning of European settlement, about 425,000,000 hectares of the US were forested. By 2017, the area of forested land has declined to 300,000,000 hectares.

What is a system of standardized unit of measurement?

Describe the movement of blood through the circulatory system.

A group of organs that work together to perform body functions is called

Surgical incision of the abdominal wall and uterus to deliver a fetus is called:

The skin is the primary organ of the

What is true for urochordates? A. The notochord is present throughout their lives. B. The notochord is present only in the larval stage; it is absent in adults. C. The notochord is present in the larval stage; it becomes vertebrae in adults.

What term is used to refer to a characteristic of a population in statistics?

Which mechanism of ion uptake would best enable a plant to produce a steady supply of chlorophyll?

Why do farmers sometimes use more wasteful methods of irrigation than are available?