Extinct and Endangered?

While at an amusement park, you inhale helium from a balloon to make your voice higher pitched. a friend says that helium reacts with and tightens the vocal cords to make your voice have the higher pitch. could he be correct? why or why not?

The brain is an example of which level of organization within an organism

Our what is complex but is based on units that are simple

Pre-lab questions 1. what are four different factors that can influence the rate of reaction? 2. which of the factors you listed in question number one has the greatest influence on reaction rate? 3.

Can a person inherit cancer genetically? explain

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.

A certain metabolic pathway can be diagrammed as, where a, b, c, d are the intermediates, and x, y, z are the enzymes that catalyze the reactions