A scientist is working with methane (CH4) and butane (C4H10). Which statement best compares these chemicals? 1. They are two different types of molecules that each contain the same number of atoms. 2. They are two different types of atoms that are each made up of a different number of elements. 3. They are compounds made of the same two elements, but each contains different numbers of atoms. 4. They are matter made of the same two compounds, but each contains different types of elements.

What is hydroelectric power produced by?

Ineed to get this test done which of the following statements is correct in hour our immune system responds to a potential pathogen? a.) the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. b.) b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c.) the adapted immune system will call on the innate immune system to destroy the pathogen. d.) the t-cells in the adapted immune systems are the first to recognize the pathogen

Which are reasons cells undergo cell division?