You see a twig floating under a bridge. You assume that wood is less dense than water and any twigs you throw into the water above the point that you saw will also travel
under the bridge. After throwing 100 twigs 99 twigs float under the bridge. 1
strangely sank. You make the conclusion that twigs are lighter than water and that
they are carried under the bridge by floating. This is known as a(n)
(2
words)

Which macromolecules are polymers made of nucleotides (a) fatty acids (b) nucleic acids (c) carboxylic acids (d) amino acides

(drag each tile to the correct location.) categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. - a tentative statement used to guide scientific investigations. - makes predictions about future events. - can be tested by many independent researchers. - based on observations of natural phenomena. - a well-established, highly reliable explanation.

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi