A group of students combined different substances together during several experiments. Their observations are recorded on the chart below. 1. A blue liquid and a yellow liquid were mixed and it turned green

2. A solid substance dissolved in a clear liquid

3. Two room temperature liquids were mixed and the temperature increased

4. Two different liquids were mixed and began to separate and layer in a beaker

In which experiment did a chemical reaction likely occur?

1
2
3
4?

"a.) well–developed vascular system."

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

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