What makes a hypothesis scientifically useful ?

Explain how the political influence of african americans leaders became weaker.

Individuals do not compete directly for resources, but are prey for the same predator

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