How can the use of fertilizers affect respiratory health?
a.
they directly produce gas particles of air pollution.
b.
they can contaminate bodies of water.
c.
they can contain contaminants that can enter the air during storms or high winds.
d.
fertilizer use does not impact respiratory health.

The phlogiston theory in the 17th century attempted to explain burning. the theory stated that combustable objects contained a material called phlogiston, a substance without mass, color, odor, etc. after objects burned, the objects were dephlogistonated and were then in their true form. the phlogiston theory was accepted until the 18th century, when lavoisier proved that combustion requires a gas that has mass. phlogiston is considered a) to be scientific knowledge b) not to be scientific knowledge c) to be proven by scientific method d) to be accepted in the modern scientific community

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient