After swallowing, how does food go to the stomach through the esophagus?

A. solely by gravity

B. pushing at the tongue

C. air pressure

D. squeezing of esophagus

How does the structure of amino acids allow them to form a polypeptide

If you compare the egg to a cell, what did you learn about how water moves into or out of a cell

How can scientists know the impact of prairie dogs on an ecosystem?

Calcium fluoride, CaF2, has a molar solubility of 2.1 x 10^-4 mol/L at pH = 7.00. By what factor does its molar solubility increase in a solution with pH = 3.00? The pKa of HF is 3.17 (A) 1.48 (B) 1.83 (C) 2.48 (D) 4.96

Which best explains the relationship between evaporation and temperature? a) A liquid evaporates slower at lower temperatures because the molecules are more spread apart and are not pushed as easily from the liquid's surface.

Butane gas is used as the fuel in disposable lighters. It burn in oxygen to form carbon dioxide gas and water vapor. What mass of carbon dioxide is produced when 53.3 g of butane is burned in 103.9 g of oxygen

Suppose a solution was too concentrated for an accurate reading with the spectrophotometer. The concentrated solution was diluted by placing 1.00 mL of the concentrated solution in 4.00 mL of water.

What kinds of scientific investagations involve making observations

According to the kinetic molecular theory, when a gas particle hits something what will happen?

Protons and neutrons are made from which of the following? hadrons down quarks only up quarks and down quarks up quarks only