What is the purpose of controlling the environment when testing a hypothesis?
it allows the scientist to determine the effect of the changed variable.
it allows samples and organisms to be tested under comfortable conditions.
it makes it easier for the scientist to perform the steps of the experiment.
it ensures that the scientist is undisturbed while performing the experiment.

The term used to describe a disease-causing microorganism isa. virus.b. infection.c. pathogen.d. microbe.e. bacterium.

After reading the paragraph below, answer the questions that follow. researchers have created a robot that has a very thin leg that is moved by cardiac (heart) cells contracting in unison. the robot, made of a polymer similar to that used in making contact lenses, is bathed in heart cells with supporting cells, which then attach to the robot and provide movement as they contract. all of the cardiac cells working together can cause the robot leg to move in a way that individual cells could not. this is an example of a. emergent properties of cells. b. energy flow through an ecosystem. c. adaptation. d. internal environment regulation.

What best describes lactic acid fermentation?