Which is a law and which is a theory
1.plate tectonics
2.for every reaction , there is an equal and opposite reaction
3.evolution & natural selection
4.cell theory
5.genetic theory of inheritance
6.atomic theory
7.newton's laws of motion
8.law of universal gravitation
9.an object at rest remains an object at rest
10.earth's average temperature is rising due to greenhouse gases

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

the answers would be

the first one and the second one

cytokinesis is the splitting of a cell membrane to form 2 identical daughter cells. it's similar to mitosis as both cells have identical copies of dna and cytokinesis is a step in the mitotic cycle.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.