Why is water so effective at hydrogen bonding?

Choose 1

(Choice A)

The hydrogens in water are ionically bonded to the oxygen.

(Choice B)

Hydrogen is more electronegative than oxygen, so it is more likely to donate its electrons to oxygen.

(Choice C)

Oxygen is very electronegative and strongly attracts hydrogen's electron.

(Choice D)

There are two hydrogens, doubling the positive charge on the water molecule.

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Anurse is caring for a 42-year-old client who is scheduled for an amniocentesis during the fifteenth week of gestation because of concerns regarding down syndrome. what other fetal problem does an examination of the amniotic fluid reveal at this time?

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.