Which of these actions does NOT result in a physical change?

leaving an ice cube in a glass at room temperature

folding a piece of paper into a paper airplane

burning a log in a fireplace

mixing sugar into a pitcher of iced tea

Differences between qualitative and quantitative traits

Does the earth ever make new rocks?

In New Zealand, fishing limits for orange roughy are monitored each year. If research shows an increase in the population of orange roughy, catch limits are increased the following year. If fish numbers are reduced, catch limits may be reduced.

The United States most widely grown crop is what

If Susan and Henry continued to have children they would always have type B blood. What are Susan and Henry's genotypes

The fact that a strain of yeast with a certain defective gene can use the human version of the gene to repair itself is evidence that yeast and humans

What is the difference between a meteor and a meteorite? A meteor has more mass A meteorite reaches Earth and has not burned up A meteorite orbits the sun and a meteor does not A meteorite glows

Which of these was NOT characteristic of the first cells on Earth? A) anaerobic B) prokaryotic C) single-celled D) contained organelles

Which process occurs only in autotrophic organisms?

Nylon fiber is classified under which one of these headings? A. Protein B. Polyurethane C. Polyester D. Polyamide