All of the following are found in both plant and animal cells except ...

a. a cell wall

b. a cell membrane

c. mitochondria

d. Endoplasmic reticulum

What is the name of the organ, shown here, that makes the "lub-dub" sound in your chest?

What produces the sun's light and heat

How is urine formed in human being?

In some deserts, there are mice and lizards that are about the same size. The mice eat grains and the lizards feed on insects. Given this information, we would expect that the biomass of the a mice would be greater than the lizards.

Which factor would most likely speed up the rate of succession?

How can so much information be transmitted by DNA if it is a sequence of only four letters

Pythons are generalist predators, consuming a wide variety of prey including birds, mammals ranging from rodents to deer, and alligators.

Do animals secrete hormones to break down food

Which disease is caused by a pouching of the small intestine and peritoneum into the groin area? a. achalasia. b. hemorrhoids c. inguinal hernia d. colon polyps?

At the beginning of cell division the chromosome consists of what two sections