If a mineral leaves a red trail when scraped against an unglazed porcelain plate, which property of a mineral is being measured?

A. streak

B. color

C. luster

D. hardness

How does sonar work to map the ocean floor

A pack of wolves in arctic hair into hawks living together in the same environment would best represent which of the following? a community a population an ecosystem an organism

How does an observation about an object differ from an inference about that object

Proteins can vary in size from approximately 40 to 34,000 amino acids. a. why is there a lower limit to the size of proteins? b. why is there an upper limit to the size of polypeptides?

Explain why cystic fibrosis shortens life span

What type of learning describes when animals learn by watching or listening to others of their species?

The process of grouping things based on their similarities is?

Why do you think more blood goes to some organs and not others?

Which of the following would most likely employ a forester? A. a state governments B. lumber businesses C. national govemments D. all of the above

How do environmental scientists use technology to track polar bears?