What is the difference between xylem and phloem

What prevents odyssey from killing the sleeping cyclops

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

Ecology can best be described as the study of what