What part of the gi tract prevents a person from choking while swallowing?

a. pyloric sphincter

b. epiglottis

c. upper esophageal sphincter

d. mouth?

Choose the set that represents only the biotic components of a habitat (a) tiger, deer, grass, soil b) rocks, soil, plants, air c) sand, turtle, crab, rocks d) aquatic plant, fish, frog insect

Which of the following could result in the founder effect? A. the establishment of a small colony of nonhuman primates on an isolated island off the coast of AfricaB.

Which of the following is a step that occurs within an inflammatory response?

Which concept is not a part of the theory of evolution

Which features do most stratovolcanoes and cinder cone volcanoes have in common? violent eruptions and thin, flowing lava steep sides and violent eruptions broad base with quiet eruptions wide dome shape and thick lava

How does water pollution seem to be affecting diversity in some streams

A scientist studying algae growth in a coral reef observed that the presence of a certain type of zooplankton inhibited the algae growth. The scientist hypothesized that the zooplanton was eating the algae.

What is the purpose of soap (lysis agent) in the extraction of DNA?

In a controlled experiment, if a researcher wants to examine the effect of a high-calorie diet on an animal's weight, which of the two would be the independent variable?

TalUC 1. A sample of gold contains 3,800,000,000,000,000,000 atoms. Express this number in scientific notation.