1pt How are the muscles in your arms and legs similar to your heart muscle? O A. They all move bones back and forth.
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O B. They all contract.
O C. They are all voluntary muscles.
O D. They are all involuntary muscles.

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.

How many moles are in 7.2 x 10^23 carbon molecules? (*round to the nearest hundredth and include the unit "mol c" after your number) question 6 options:

What are the similarities of physical and chemical change ?