Which structure of a diatom is rich in silicon?

a. flagellum

b. nucleus

c. cell wall

d. eyespot

The molecule that fixes atmospheric CO2 in C4 plant is

A scientist has discovered a new plant species in the Amazon rainforest. She tells her fellow scientists that the plant she has found produces a cone.

In humans tongue rolling is dominant to the inability to tongue roll. If a heterozygous tongue roller and a non-tongue roller have a child, what are the chances the child will be a non-tongue roller? A. 0 B. 0.25 C. 0.5 D. 0.75

Genes that actively control the expression of a trait are referred to as:

When you are rested, do you have more ATP or ADP? ATP ADP

Lesson 16 what is the respiratory system

Whit is the relationship between monomers and a polymer

Which statement about the U. S. Clean Water Act is true?

The United States uses which source of energy to produce almost 40 percent of its electricity? A. solar B. water C. biomass D. wind E. coal

Which cell breaks down carbohydrates