Breathing is an essential life function ? True or false

There are six elements that make up most of the human body. which of the following is not one of these six elements?

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons