Sometimes called a "dirty snowball" has a hydrogen cloud has a coma and a nucleus invisible except when near the sun this is a description of a(n) a) asteroid. eliminate b) comet. c) meteor. d) star.

Which of the following does not describe a physical property of iron? a iron is silvery-white or gray in color. b iron has a boiling point of about 3,000°c. c iron is a magnetic element . d iron and sulfur react to form iron sulfide.

Which best describes a benefit of using dna technology in medicine? a) medicine can be produced in mass quantities. b) medicine can be distributed at a reduced cost. c) medicines have fewer side effects. d) medicines are resistant to antibiotics.

Archaebacteria use for movement. celia flagella pili cell walls