Why do animal cells burst when they are hypotonic?

Ineed to know why d is the correct answer asap

Where substance is produced during cellular respiration

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