According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants? a there is no relationship. b the mass of the products is sometimes greater. c the mass of the reactants is greater. d the masses are always equal.

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

Animals that reproduce sexually either do it through external or internal fertilization. read the following statement and decide if it is true or false. birds reproduce through external reproduction which is because the female will then be able to protect the egg.