How many countries does North America have?

when scientist make major discovery, which of the following must they do to ensure that this knowledge survives in the future?

Predict how the removal of an herbivore from a food web could affect the entire community.

A order is composed of a number of related ... a) kingdoms b) phyla c) families d) species

When the acetylcholine binds to the receptor sites ... sodium ions diffuse through and leave the cell. sodium ions diffuse through and enter the cell. a ligand is formed. the sodium channels remain closed. the sodium channels open?

Why might it be better to call a full moon a half moon?

Which of these is an example of an endoparasitic relationship? O A. A tapeworm living in an animal's intestine O B. A rabbit eating lettuce in a farmer's garden O C. A tick living in an animal's fur coat O D. A snake eating a mouse in a cornfield

Why is the presence of organic material in the soil important? A) It wards away plant eating organisms. B) It increases plant growth. C) It increases sunlight absorption. D) It increases water absorption.

Which derived characteristic is shared by at least four organisms? Large brain Lungs Mammary glands Placenta

Question 2 For an object to remain at rest, which of the following must be true? A. The forces on it are balanced B. There is no friction C. Gravity doesn't act on it D. The object has no mass

Identify another invertebrate chordate other than hagfish.