The answer is d. predation.
Hunting in packs, Orcas will attack and stun a seal by throwing it up into the air. It is assumed that hunt and prey upon crabeater seals like they do most other seals, although there has not been documentation of such behaviors with Crabeater seals.
Fun facts: Crabeater seals eat krill instead of fish, and over 80% of crabeater pups are prey for the more vicious, carnivorous leopard seals! :D
Without a nucleus, multicellular life forms, called eukaryotes, would not exist. According to the Molecular Expressions , the nucleus acts as the administrative center and information processor for the cell by storing its genetic material and coordinating its activities.
It’s c and reminder~ you are loved and needed :)
