Carbon-14 is most useful for determining the age of which fossils? (1)eurypterids that lived during the Paleozoic Era.

(2)mastodonts that lived during the Cenozoic Era.

(3)placoderms that lived during the Paleozoic Era

(4)algae that lived during the Precambrian Era.

Select the correct answer from each drop-down menu. in an experiment, dr. travis examined the effects of calcium intake on osteoporosis, a condition that causes an increased risk of bone fractures. the amount of calcium is variable. the risk of bone fractures .

The table lists the observations students made about four specimens under a microscope. based on these observations, what specimens did the students examine? animal plant virus prokaryote cell membrane present ribosomes present lysosomes present nuclear membrane present cell wall present ribosomes present nuclear membrane absent cell wall present ribosomes present nucleus present large vacuole present reproduces inside of a cell nucleus absent rna present 2019 edmentum all rights reserved intl

Which of the following is a responsibility of a scientist