Scientists can use many strategies during investigations, including heldwork, surveys, models, and experiments. Which of these phrases best describes an experiment?
A mathematical analysis of data
B. observation of animals in their natural world
Ci collection of data from an uncontrolled environment for comparative purposes
D. procedure with controlled conditions and test and outcome variables

D

Explanation:

Question: Scientists can use many strategies during investigations, including heldwork, surveys,

models, and experiments. Which of these phrases best describes an experiment?

A mathematical analysis of data

B. observation of animals in their natural world

Ci collection of data from an uncontrolled environment for comparative purposes

D. procedure with controlled conditions and test and outcome variables

b. examine and describe cells

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error