If similar fossil collections are found on two continents, now widely separated, what is a possible explanation

What are two reasons for why a species might disappear from the fossil record?

Chimeras are interesting organisms that have two different sets of dna. chimeras occur when when two different zygotes fuse to form one organism. some chimeras have no outward symptoms,while some have two different eye colors it two different blood types what roles do mitosis and meiosis play in the process

Achemical substance made by glands in the endocrine system that travel through the bloodstream and affects cells and tissues throughout the body ?