Why is water so effective at hydrogen bonding? a there are two hydrogens, doubling the positive charge on the water molecule. b hydrogen is more electronegative than oxygen, so it is more likely to donate its electrons to oxygen. c the hydrogens in water are ionically bonded to the oxygen. d oxygen is very electronegative and strongly attracts hydrogen's electron.

Amutagen is 1: a living thing that has undergone a mutation. 2: an agent that causes a mutation in dna. 3: a mutation that has affected one gene. 4: a chemical that can poison living cells.

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

Contrast how pollination is different among gymnosperms and angiosperms.