A comet is a A. meteoroid that travels through Earth’s atmosphere and hits the surface.
B. meteoroid that burns up in Earth’s atmosphere, producing a streak of light.
C. small, rocky object that orbits the Sun and is usually found in a belt between the orbits of Mars and Jupiter.
D. small object made of ice and dust that orbits the Sun and forms a coma as it approaches the Sun.

How do tides affect the organisms living in intertidal zones? a. no organisms live in intertidal zones due to the tumultuous environment. b. the mechanical forces of the waves keeps the organisms clean. c. only plants live in intertidal zones because the animals float away with the waves and never return. d. the mechanical forces of the waves can dislodge the organisms from their habitat.

Identify the composition of oceanic and continental crystal rocks.in a model of earth’s interior,where would these rocks appear?

American scientist, linus pauling, was one of many scientists racing to discover the molecular structure of dna. pauling initially thought that the molecule was a triple helix. later, james watson and francis crick unveiled their double helix model, which turned out to be an accurate description of the molecule's shape. why did watson and crick succeed when pauling failed?