Yes, it is okay. you should never change your hypothesis if it was wrong.
That isn't even possible. Your body is made of them. If you had none then you wouldn't be existing.
<span>Traits are determined by proteins that are built according to the instructions stored in the genes.</span>
The remains are called fossils. Fossils are remnants of animals, plants, or microorganisms that have been solidified in the process of fossilization, where the organism is surrounded by sediment, minerals, and other solid objects which are compressed and heated around the organism over time. This forms a solid mass with the preserved organism inside, other known as a fossil.