Please help Easy 10 points and brainliest

What is a key distinction between a trial court and an appellate court?
A. The presence of a judge
B. The involvement of attorneys
C. The number of witnesses
D. The presence of a jury

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