1. What do the arrows in a food chain or food web represent?

Is every compound that contains hydrogen an acid?

Which statement best describes evolution? A. Species have changed over time B. Traits acquired during a lifetime are Passed to offspring C. Earths organisms have not changed overtime D. All of earths organisms were formed at the same time

The process of breaking a complex substance down into smaller components is called a. metabolism. b. anabolism. c. catabolism. d. neutralization. go to previous question. go to next question. review answer selection

How are shadows formed?

Which of the following is a balanced chemical equation? MgF2 + Li2CO3 ⟶ MgCO3 + LiF CH4 + 2O2 ⟶ CO2 + H 2Al + 6HCl ⟶ 3H2 + AlCl3 P4 + 3O2 ⟶ 2P2O3

An atom that contains 22 protons, 23 neutrons, and 22 electrons would have a mass of approximately

Compared with a ph of 7, a solution of ph 5 has what times/fraction of the hydrogen concentration?

Write a formulae equation to represent the combustion of carbon to form carbon dioxide and the thermal decomposition of magnesium carbonate

A5.00 liter ballon of gas at 25 degree Celsius is cool to 0 degrees Celsius. What is the volume (liters) of the ballon?

How much thermal energy (q) is required to heat 15.2 g of a metal (specific heat = 0.397 J/G) from 21.0 degrees C to 40.3 degree C