Which substance is comprised of more than one element?

aluminum

helium

silver

steel

From the list below, select the enzyme that has high activity in an acidic environment. question 9 options: a. amylase b. gastrin c. trypsin d. pepsin e. sucrose

Using 2 strains of pneumonia bacteria, Avery and his colleagues demostrated that the transforming factor in cells are A. RNA B. DNA C. RNA polymerase D. Phosphate groups

Whar are the five kingdoms of living organisms? With examples.

How does a diaphragm prevent pregnancy Select one of the options below as your answer: a. It releases spermicide into the uterus to keep sperm from fertilizing eggs. b. It produces hormones that keep a woman's ovaries from releasing eggs. c.

You have been at the beach all day and forgot your sunglasses. what part of the eye is most likely damaged?

Match the meaning to the word part

The process in late pregnancy when the fetal head begins to decend into pelvis.

Why can flowers rapidly germinate?

What is the water cycle driven by?

Which is not a way plants try to limit undesirable pollinators