The "First Wave" of Holocene extinction began with disappearance of very large animals by A. overkill (hunting) B. introduction of invasive species C. loss of habitat by global warming

The "First Wave" of Holocene extinction, which is often referred to as the Quaternary extinction event, began with the disappearance of large (megafauna) animals around the world. This happened approximately 10,000 years ago, at the end of the last Ice Age.

There are several theories as to why this happened:

A. Overkill (hunting): This theory suggests that human hunting was responsible for the rapid extinction of large animals after the last Ice Age. As humans migrated around the world, they relied on hunting for survival. The overkill hypothesis suggests that the hunting was so intensive that it led to the extinction of many species.

B. Introduction of invasive species: This theory suggests that as humans migrated, they brought with them other species (plants, animals, diseases) that were invasive to the new environments. These invasive species could have out-competed native species for resources, leading to their extinction.

C. Loss of habitat due to global warming: This theory suggests that the warming climate after the last Ice Age led to significant changes in habitats around the world. These changes could have been too rapid for many large species to adapt to, leading to their extinction.

It's important to note that these theories are not mutually exclusive and it's likely that a combination of these factors led to the "First Wave" of Holocene extinctions.