James was observing cells under a microscope. He observed some cells which had a layer outside the plasma membrane. What is this layer called?

A. Cell membrane

B. Cell wall

C. Nuclear membrane

Like many plans to protect endangered species, the plan to reintroduce wolves causes some people to weigh their own interests against the needs of a single species.

What would a solar eclipse look like if the Moon were smaller than it is now?

Why is it difficult to know the impacts of deep sea mining? A. It has never been tried successfully, so we don't know exactly how it can be done. B.

Most multicellular organisms are composed of cells with different shapes and sizes, and those cells perform different functions. What is the best explanation for this? A.

What are WBCs and what do they create to fight off infections?

Which of the following is NOT true of Jupiter

Which of the filling is a bacterial disease? a) flu b) cholera c) measles d) common cold

A measurement of a star's brightness is called

You are operating a powerboat at night. Your red sidelight must be visible to boats approaching from which direction (s) ? head-on only head-on and both sides head-on and behind head-on and port (left)

A graduate student finds an organism in a pond and thinks it is a freshwater sponge. a postdoctoral student thinks it looks more like an aquatic fungus. how can they decide whether it is an animal or a fungus?