It was originally estimated by scientists that the carrying capacity of humans on earth was
approximately 1 billion people. The population of
earth is now over 7 billion people. What is the
best explanation for this?

pregnancy happens more and more

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."