I have just arrived on another planet in a distant galaxy. I stumble upon things I think are living organisms. Which of the following is/are evidence(s) that they are alive? (select all that apply)
They are eating plants.
There are baby “things” all around them.
They smile when I wave at them.
They are various sizes (suggesting some have grown larger than others).
The tissue I scraped off of them seems to be made of cells.