Atom, molecule, cell, tissue, organ, and organ system
A hypothesis is considered scientific if it has something that can be supported or refuted through carefully crafted experimentation or observation
The forelimbs of all mammals are homologous traits, meaning that they originate from a common ancestral trait.
The correct answer is therefore C. Homologies (homologous traits), from the same common ancestor.
(To clarify, we know it is from a common ancestor because both bats and humans are mammals)
Answer:
Virus.
Explanation:
Viruses can't reproduce without invading the cell of another living being.
