Biology Unit 9

Elijah Brycth B. Jarlos IX-Argon
1. Multicellularity is a condition of an organism to have multicellular cells. An example of a organism who has multicellular cells are plants, animals, and humans. The main reason of why scientists have a hard time finding a good set of existing organisms to compare. Is neither the first set of organisms which is being compared is dying as fast as the second specimen is being examined or they just can’t find the right species.
2. The single cell Chlamydomonas evolved by repetitive DNA replication and mitosis.

3. The evolution of multicellular life from simpler, unicellular microbes was a pivotal moment in the history of biology on Earth and has drastically reshaped the planet 's ecology. However, one mystery about multicellular organisms is why cells did not return back to single-celled life.

4.

The advantages of being multicellular is they can mostly adapt to a wide variety of environments, they grow very large relative to their size when they were born, they can also work more because they have very specialized tissues for a specific function, and lastly they live longer than unicellular organisms. But since they can do more work they need more energy to do a wide variety of things, and if one organ fails the whole organism can die. While the advantages of unicellular organisms is that they are easier and quicker to adapt to changes in the environment due to their relative small size, and they also reproduce faster. But the disadvantages of being unicellular is that they cannot grow very large, they don’t live as long as multicellular organisms because they have only one cell to do all work, they usually live in water for if they did not they will dry up quickly and must live in a food rich environment, and lastly they must take everything they need through their cell