A student made a model of a river in a sandbox. A pile of sand represents soil and bits of rock in the riverbed. Water

pouring from a hose represents river water as it flows

downhill.

Which two characteristics are limitations of the student's model?

Llama have 74 chromosomes how many chromosomes will they be found in their gametes explain how you know

As air becomes more dense, (select all that apply) o. air weighs less o. gas molecules are closer together o. air is colder o. air weighs more o. gas molecules are further apart o. air is hotter

Many pharmaceutical drugs are organic compounds that were originally synthesized in the laboratory. which two scientific disciplines are bridged by pharmaceutical drugs? chemistry and forensics chemistry and medicine biology and forensics biology and criminology