A chopper an odd shaped rock that was used to cut things.
Answer:
It is a common nitrogenous waste produced by the breakdown of amino acids in various cells in the body. Waste product of protein catabolism that is mainly filtered from blood in the kidneys and excreted in urine.:
The correct answer is an experiment.
An experiment refers to an investigative study, where a researcher scientifically tests a hypothesis. Specifically, a researcher tests the effect an independent variable (manipulated variable) on the dependent variable (outcome), to investigate whether there is a causal (cause and effect) relationship between the variables. For instance, if a researcher wants t<span>o determine a cause and effect relationship between alcohol consumption and driving ability, he or she would use an experimental research study to do so. </span>
Teamwork . They might’ve also developed tools to help or maybe animals idk
