Extra Terrestrial Events

After collecting rock samples from the past space mission to Mars, I discovered some fossils entrenched in some of the rocks. The fossils resembled prehistoric creatures on Earth, though they were incomplete sets. One of the fossils was something similar to a tusk from a mammoth as it resembles some of the fossils we found on Earth. Another fossil resembled the claw of a veliciraptor, a dinosaur from the Jurassic era with a distinct toe claw. My theory is that Mars was becoming unliveable so Martians sent the prehistoric animals we know today to Earth to see if they could survive. It's the only theory that can explain all discovered evidence.