Please help, pedigrees. A is the ability to taste PTC (dominant trait)

A_ when genotype is uncertain

aa PTC non-taster

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.

it should be d) transitional fossils.

they show the gradualism of evolution throughout a period of time