Which of the following diseases primarily affects children?

cholera

yellow fever

mumps

rabies

A small creek runs through a mature forest, keeping the soil around the creek damp all year. A variety of ferns and several flowering plants thrive in this shady, moist area.

Phytoplankton can gain nutrients from whale poop. True False

The flow of energy through an ecosystem always begins with what types of organisms?

Which of the three macronutrients form the enzymes critical to the thousands of chemical reactions required to sustain life?

Kai has been warned by her nutritionist that taking large amounts of a certain vitamin can be toxic because it accumulates in the liver. which vitamin?

With which atoms does carbon most frequently bond

What is a karyotype?

A scientist has been working for 15 years to develop a new type of plastic material, but she has not yet been successful. Which of the following best explains why her work is still a success?

Technology can have good and bad effects. What is a bad effect of spraying pesticides on crops

Can your body make antibodies for pathogens that you have never been in contact with