There are an estimated 12,600 spiders in a region of 525 square meters. How many spiders are there per square meter? The population density of spiders is per square meter.

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