An unknown mineral sample scratches a glass plate but cannot be scratched by a carpenter's nail. For identification purposes, how is the mineral's hardness described?

Why do some foods have more caloric content per unit mass than other foods?

DNA replication results in two DNA molecules, a) each with one new strand and one original strand. b) one with two new strands and the other with two original strands. c) each with two original strands. d) each with two new strands.

When does fermentation occur?

A company in San Francisco uses petroleum products to make plastics. Arrange the sentences in the correct order to show how the company could be contributing to climate change.

A nurse is beginning a physical exam on a child who is admitted to the pediatric unit with suspected meningococcal meningitis. What is the nurse's priority action?

Why is salt so precious in the rain forest?

A human activity that could significantly decrease the amount of carbon dioxide in the air is (1) increasing the use of fossil fuel (2) controlling insect pests that eat stored grain (3) burning garbage and trash to generate electricity (4)

What are somatic cells

What type of bacteria causes environmental change

Contrast a food chain with a food web, and include the total % of energy which is conserved between each level of a food chain