The only option given above that is true for natural selection to occur is option d: 'there must be competition for resources'. Natural selection would also occur under predatory pressure. Natural selection occurs through individuals with advantageous characteristics (phenotypes) surviving and passing on their genes (genotypes) to their offspring.
Quite a bit of heat and pressure is needed to change an igneous/sedimentary rock to a metamorphic
Answer is option a because if a person exhibit trait box close and if a person without trait circle open.
I'm not positive but I believe the answer would be D
