Is a rabbit hole a biotic or an abiotic factor

Acquired mutations can result from radiation pollution toxins inheritence select all that apply

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled

Which of the following are responsible for sending messages from the hypothalamus to the thalamus?