Elephants and rhinos tolerate the small birds that ride their backs and eat insects on their skin. the relationship between the elephants and the birds is called

Take two glasses, fill one with water and leave the other empty. Place them side by side. Fold a paper towel lengthwise and put one end into the water in the glass with water. Stick the other end of the paper towel in the empty glass.

How many heart chambers does a shark have?

Biologists think early eukaryotic cells might have formed from prokaryotic cells that A. had a flexible outer cell membrane instead of a stiff cell wall B. gradually developed a stiff outer cell wall for protection c.

What causes the ocean waves that surface use for their sport

What cavities are in the head, but are not included within the major cavities?

Freud believe that certain troubling symptoms could be traced to painful unconscious memories. This led him to suspect that these symptoms resulted from

Reducing the volume of a gasits pressure if the temperature of the gas and the number of particles are constant.

Salt deposits form on a car in the winter. Over time, the salt covers more of the car. Is the salt alive? a. Yes, salt deposits are alive because they maintain their structure. b. No, salt deposits are not alive because they do not reproduce. c.

Belinda recently completed a treatment program for breast cancer. For the last year, she took a drug treatment that worked to interfere with rapid cell division; what type of cancer treatment did Belinda undergo?

What do scientists call the theory that the universe will shrink in the future?