This is a muscular tube through which food passes, aided by peristaltic contractions, from the pharynx to the stomach.

A geologist discovers that the number of fossils of a single species decreases significantly in higher rock layers compared to deeper rock layers. Which conclusion can best be drawn from this evidence?

All animals eat to obtain a. oxygen. b. ammonia. c. carbon dioxide. d. nutrients

Plants in the desert

What is the main reason that it takes 2 to 3 minutes for the reaction to occur between sucrose and sulfuric acid in the dehydration of sucrose

How does matter move through biogeochemical cycles

Which of the following is not a macronutrient? A) Carbohydrates B) Protein C) Vitamin C D) Fat

Agglutinins are surface antigens on RBCs. contain abundant stained "granules." prevent blood clotting. are antibodies that will attack surface antigens on RBCs of a different blood type.

Which of the following best explains why humans need constant supplies of fresh water? a. Humans need a constant supply of water to provide them with essential vitamins. b. Humans need a constant supply of water to maintain proper hygiene. c.

Which one of the following would be a good tool to represent data in terms of percentage of a whole?

A. E. coli is able to use foods other than glucose in the absence of available glucose, because falling levels of glucose cause an increase of B) activator protein A) operator B) promotor C) structural gene D) CAMP