Answer: The percentage of unknown material has grown in scientists estimates since the 1970’s; the percentage of dark matter has shrunk in scientists estimates since the 1980s
Explanation:
<u>oxides</u> and <u>hydroxides</u>, as they have the highest chemical composition with different criteria's.
<span>Large carnivores in general are often used as indicator species because of their seat at the top of the food chain. ... When a large carnivore is missing from an ecosystem this can
reflect problems in prey populations, usually caused by larger issues
such as over-harvest of game, presence of disease, or habitat changes.</span>
B. It provides information about why certain measurements are made in an experiment
From experience, to be able to have background research helps in the design of an experiment because it would tell you what is being measured in a experiment. Without the background information, my whole class got lost on what to do until my teacher told us what we had to measure and how we could measure the experiment.
