An owl cannot entirely digest the animals upon which it prey
therefore, each day it expels from its mouth a pellet comp
of materials such as fur, bones, and cartilage by examining owl
pellets, ecologists are able to determine the

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes