Honestly man I don't even know how much I've said this but Living Longer and Ecological History of Humanity is probably the easiest subjects I've done. Yeah they both have a final essay but since you literally do not need to go to any lectures throughout the semester and just do some readings for each week so that you don't look like an idiot in tutorials, semester work is practically 0. Seriously consider it. And if you do choose it, I'd recommend emailing the coordinator of the subject which I believe is the same for both Richard Trembath, and finding out his tutorial times. He's pretty awesome...
Oh yeah and from the start of semester they give you the topics for the essays. So you can start from day 1 and have it ready for the end of semester. Really, you don't need any info from lectures to answer them