The salinity of a body of water suddenly starts increasing. a chemist believes that upstream contaminants are polluting the lake. a geologist believes that underground formations might be leaching into the body of water. why are both of these options valid scientific hypotheses?

a)scientists with different educational backgrounds may put forth different hypothesis to explain the same data.
b) neither one is a valid hypothesis since they were made before data collection.
c)the scientific community never discards a hypothesis even if it is unsupported by data.
d) both scientists underwent the same training and, therefore, have equally valid scientific hypotheses regardless of the available data.

Which statements correspond to cellular respiration? co2 diffuses passively into the cell. co2 diffuses passively out of the cell. co2 must be pumped out of the cell. o2 diffuses passively when produced inside the cell. o2 diffuses passively when converted to co2. o2 is pumped in and forces co2 out.

When in solution, a molecule that moves slowly across an artificial membrane moves rapidly across a plasma membrane. this molecule rapidly enters the cell regardless of whether its concentration is higher inside or outside the cell. using this information, which transport mechanism is most likely to be responsible for the movement of the molecule across a plasma membrane? view available hint(s)when in solution, a molecule that moves slowly across an artificial membrane moves rapidly across a plasma membrane. this molecule rapidly enters the cell regardless of whether its concentration is higher inside or outside the cell. using this information, which transport mechanism is most likely to be responsible for the movement of the molecule across a plasma membrane? active transportexocytosis

Paint and solvents pose no potential hazard to human health. select the best answer from the choices provided t f