Iwill mark brainliest! the half-life of a radioactive element is the length of time it takes for half of a given amount of the
element to break down, or decay.
true
false

Which of the following correctly list the first appearance of organism in the fossil record from earliest to most recent

As the human population grows, what happens to our natural-resource requirements? o they increase o they decrease o they do not change. they go in cycles

Graded assignment lab report answer the questions below. which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.