Answer:
The endosymbiotic theory
Explanation:
Protists are the multicellular organisms which possess characteristics of both the prokaryotes and eukaryotes.
The protist can derive nutrition by either heterotrophic mode or photoautotrophic mode. This variation could exist within the same genus and same species.
This variation could be explained with the endosymbiotic origin of the organisms as some species could engulf the photosynthetic bacteria whereas some could have engulfed the chemosynthetic bacteria.
This can be observed in the green and red algae which depend on a different mode of nutrition belonging to the same group.
Thus, the endosymbiotic theory is correct.
According to theories concerning the origin of life, the atom is likely choice for the basic element of all living things because it :
B. Is relatively stable and can form four covalent bonds
This bonds will signify stability.
hope this helps
The reticular connective. I'm not going to lie, I learned that from NBC Hannibal and I fact checked it and it is correct! XD
The lymphatic capillary is called as lacteal
