If he breeds his straighteared cat with a Scottish fold with no severe health issues , what percentage of kittens will have folded ears ? What percentage will have the potential for severe arthritis (SF / S * F) ?

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