Why do ecosystems constantly need new energy

If two parents who's blood types are both b produce a child that has blood type o, what can you say about the parent's genotybes? oa) one is ii ob) one is ibi oc) both are bi od) nothing, this is impossible

Adoença vitiligo afeta qual doença do corpo?

Everything in the universe originated from a single point. how was it possible for everything in the universe to have occupied a single point in space?