Why must artery walls be thicker than vein walls

Which of the following is NOT an example of a once-accepted scientific fact or theory that turned out not to be true? A) The Milky Way Galaxy is the universe. B) Earth, fire, air, and water are the four elements.

Existing landfilles are generally considered sufficient to serve as the sole means of disposing of the nations waste for the foreseeable future. True/false

2. The diagram below shows the general structure of an amino acid. Which type of molecule is formed from amino acids?

Why did Hershey and Chase label the viral DNA with radioactive phosphorous and not radioactive sulfur? a. DNA contains phosphorus and no sulfur. b. Proteins contain phosphorus and no sulfur. c. DNA contains sulfur and little phosphorus. d.

In the citrate cycle, oxaloacetate is formed from malate. Oxaloacetate is then used as the starting substrate in another round of the citrate cycle. But oxaloacetate is also a precursor for many other molecules.

Which statement best describes the relationship between activation energy and rate of reaction? O Increasing the activation energy can increase the rate of a reaction. O Reducing the activation energy can increase the rate of a reaction.

Definition: this is a haploid cell with half the reproductive information from the parent.

Does a cell use energy when molecules diffuse in or out of the cell? Why?

Below is a list of possible challenges. Check all errors that you mentioned in your answer. Traits other than beak type might affect natural selection. It could take many generations to observe adaptions to a population.

A farmer dug a well but did not find any water Which reasons most likely explain why the farmer did not find water? Check all that apply.