My comments: I designed three main types of aliens for my Elise t’Hoot books: The beings in tree-like shells, the ancient, gigantic crab-scorpion frights and the gaudily clothed bipeds the characters talk about. For example, the treeish Amigos can levitate and pull water and mineral from the ground, Elise is abducted and finds she can wear the Tooli robes, and few books later she is awed by the Critch-Critch who are threatening Earth. This article caught my eye as it helps justify the Tooli, and really the others as well.
Date: October 31, 2017
Source: University of Oxford
Summary: For the first time, researchers show how evolutionary theory can be used to support alien predictions and better understand their behavior. They show that aliens are potentially shaped by the same processes and mechanisms that shaped humans, such as natural selection. The theory supports the argument that foreign life forms undergo natural selection, and are like us, evolving to be fitter and stronger over time.
These illustrations represent different levels of adaptive complexity we might imagine when thinking about aliens. (a) A simple replicating molecule, with no apparent design. This may or may not undergo natural selection. (b) An incredibly simple, cell-like entity. Even something this simple has sufficient contrivance of parts that it must undergo natural selection. (c) An alien with many intricate parts working together is likely to have undergone major transitions. Credit: Helen S. Cooper
The Journal Article (edited by Science News):
Hollywood films and science fiction literature fuel the belief that aliens are other-worldly, monster-like beings, who are very different to humans. But new research suggests that we could have more in common with our extra-terrestrial neighbours, than initially thought.
In a new study published in the International Journal of Astrobiology scientists from the University of Oxford show for the first time how evolutionary theory can be used to support alien predictions and better understand their behaviour. They show that aliens are potentially shaped by the same processes and mechanisms that shaped humans, such as natural selection.
The theory supports the argument that foreign life forms undergo natural selection, and are like us, evolving to be fitter and stronger over time.
Sam Levin, a researcher in Oxford’s Department of Zoology, said: ‘A fundamental task for astrobiologists (those who study life in the cosmos) is thinking about what extra-terrestrial life might be like. But making predictions about aliens is hard. We only have one example of life — life on Earth — to extrapolate from. Past approaches in the field of astrobiology have been largely mechanistic, taking what we see on Earth, and what we know about chemistry, geology, and physics to make predictions about aliens.
‘In our paper, we offer an alternative approach, which is to use evolutionary theory to make predictions that are independent of Earth’s details. This is a useful approach, because theoretical predictions will apply to aliens that are silicon based, do not have DNA, and breathe nitrogen, for example.’
Using this idea of alien natural selection as a framework, the team addressed extra-terrestrial evolution, and how complexity will arise in space.
Species complexity has increased on Earth as a result of a handful of events, known as major transitions. These transitions occur when a group of separate organisms evolve into a higher-level organism — when cells become multi-cellular organisms, for example. Both theory and empirical data suggest that extreme conditions are required for major transitions to occur.
The paper also makes specific predictions about the biological make-up of complex aliens, and offers a degree of insight as to what they might look like.
Sam Levin added: ‘We still can’t say whether aliens will walk on two legs or have big green eyes. But we believe evolutionary theory offers a unique additional tool for trying to understand what aliens will be like, and we have shown some examples of the kinds of strong predictions we can make with it.
‘By predicting that aliens undergone major transitions — which is how complexity has arisen in species on earth, we can say that there is a level of predictability to evolution that would cause them to look like us.
‘Like humans, we predict that they are made-up of a hierarchy of entities, which all cooperate to produce an alien. At each level of the organism there will be mechanisms in place to eliminate conflict, maintain cooperation, and keep the organism functioning. We can even offer some examples of what these mechanisms will be.
‘There are potentially hundreds of thousands of habitable planets in our galaxy alone. We can’t say whether or not we’re alone on Earth, but we have taken a small step forward in answering, if we’re not alone, what our neighbours are like.’
Journal Reference:
- Original Study: Samuel R. Levin, Thomas W. Scott, Helen S. Cooper, Stuart A. West. Darwin’s aliens. International Journal of Astrobiology, 2017; 1 DOI: 1017/S1473550417000362
- This version: University of Oxford. “Aliens may be more like us than we think: What evolutionary biology tells us about how aliens could look.” ScienceDaily. ScienceDaily, 31 October 2017. <www.sciencedaily.com/releases/2017/10/171031202151.htm>.
An excerpt from 
and nobody present. He wanted to get an early start with his investigation of the crash site and came to ask San Luis along to spite the Commander. The whole cabal of them was missing from the Portico, but those odd trees were blocking his way to check the pod; the door stood ajar but he saw no sign of movement. Did they bunk in there last night? He scanned the tree line, unwilling to wander around in there on foot on the chance of finding someone. Without Marta or anyone, the tree things worried him; he couldn’t shake the idea they knew he’d spoken out against them.
“You don’t believe that rot about some of the trees being aliens? Come on, man, there are some freaky trees that will be cleared off with the rest. Period.” He looked nervously over to the trees that seemed more unsettling in the growing light, seeming to stir out of time with the breeze. How did they come to gather around the pod?
on screen the next second.
version I went over with ProWriting Aid ( https://prowritingaid.com) and formatted with 
interior template and cover template and got the book accepted on Kindle!
How Would You Do It? 