Two students push on a car stuck in the mud with a force of 20 Newtons, 21

but they are unable to move it. How much work have they done?

A. O Joules

B. 20 Joules

C. 40 Joules

D. Not enough information given to answer this question.

Which of these is a disadvantage of hydroelectric energy? A. Is expensive to build or maintain B. Has high power plant efficiency C. Has a long power plant life span D. Reduces greenhouse gas emissions

A scientist is examining a fossilized insect that may be an ancestor of modern dragonflies. Which of the following should the scientist compare to best determine how closely related the fossilized insect is to modern dragonflies?

How does streamlining play a role in our daily lives

The molecules that are recognized as foreign on allografts are called:

Your patient has a hematocrit of 56%. You recall from your anatomy and physiology class that high hematocrits are often a sign of blood doping by athletes. However, your patient is an elderly man suffering from the flu.

Which vessels allows for oxygen movement into the tissues

What is the difference between a physical and a chemical change

What is described by binary fission? A) The way prokaryotes move. B) The way prokaryotes produce energy. C) The way prokaryotes reproduce. D) The way prokaryotes digest nutrients.

There are many different ecological and environmental conservation methods. Which is not a conservation method? A) water harvesting B) fishing seasons and limits C) limiting of clear cutting of forests D) wind and wave erosion on coastal areas

Explain when and how dire wolves became extinct.