Answer: multi-cellular bodies
Explanation: All animals are multi-cellular. This means that they are made up of many cells/cellular systems. Single-celled organisms, on the other hand, are not considered animals. Those would mostly be too tiny to see without the aid of a microscope tool. The other answer choices would not fit, because not all animals have bones (endoskeletons or exoskeletons). Also, only some animals are cold blooded, which is what the last answer choice has to do with.
No..a mutation in human skin acquired is called a somatic mutation, and it cannot be passed on. Mutations can only be passed on from sex cells (aka germ-line mutations can be passed onto offspring)
The simplest form of methane is of carbon and hydrogen atoms. Hydrocarbons. Methane can otherwise be known as CH4.
