Which molecules are connected by hydrogen bonds?

Which blood cell spend most of their time in the lymphatic system?

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat

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