Answer:
All mammals (including humans) have the same distinctive features. These include: fur or hair growing from the skin. mammary glands that, in females, produce milk for feeding the young.
Explanation:
The answer would be C. Tears because the others have shown to be invaders
Technically this can be answered in a number of ways. But in elementary biology the cell is considered to be the basic unit of life.
I would give them water and when they start swimming it's a proof that they have been alive, after all, how would they start moving if they have been dead
