Allen and andrew have the same biological parents. why do they not resemble either of their parents?

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

Moving down the ramp from 6 meters to