Which of the following is generally required for something to be considered living or alive?

Carbon-12 and carbon-14 both have 6 electrons and 6 protons. Carbon-12 has 6 neutrons, while carbon-14 has 8 neutrons. Carbon-12 and carbon-14 are ______________.

Theories, like the theory of evolution or cell theory, are ______________.

Different versions of genes that code for particular versions of traits are called _____________.

The percentage of erythrocytes in a sample of whole blood is measured by the _______.

Stimulation of the parasympathetic nervous system increases heart rate and the force of contraction.

Which of the following nerves carries parasympathetic nervous system signals to the heart?

In exercise 3, activity 1: what happened to the resting membrane potential if the extracellular K+ concentration was increased?

What is a spindle?

Explain how each of the following contributes to the charge of an atom: protons, neutrons, and electrons. In other words, what type of charge do they each have?