A multicellular organism is one that contains more than one cell. This means that the organism is able to divide into different parts, and to function as a whole.
A lifeform is any type of creature that lives on Earth. This includes animals, plants, and even microbes.
To colonize is to take over a new area and make it part of your own country or empire. Sometimes this is done by force, but other times it is done by convincing the people there to join your country or empire.
Devouring something means to eat or drink it completely. If you devour an entire cake, you've eaten it all.
A fistfight is a fight between two people using their fists. It can be very violent, and it's usually a very dangerous situation.
When there is a roadblock, police or other officials are stopping people and asking them to show their identification. This is usually done to check for illegal immigrants or to collect taxes.
Timescales are a way of measuring how long something will take. They are usually measured in hours, days, weeks, or months.
When something is uninhabitable, it is not able to be lived in or used. This can be because of a natural disaster, war, or some other problem.