A cell replicating itself.
Chordates
Chordates have the 4 unique characteristics, postanal tail, notorchord, pharyngeal gill slits and dorsal-hollow nerve cord. Lancelets is the group of chordates that has a notochord and includes separate males and females.
Lancelet exhibits the four basic characteristics of phylum Chordata. It has a dorsal nerve, a notochord, a post annul tail, and pharyngiall gill slit.
Jawless fish, cartilaginous fish, and bony fish have notochord when they were still young but it was replaced by a vertebral column as they mature.
<span>Lancelets are included in the subphylum cephalochordata. Cephalochordates are gonochoristics. It means that the sexes are separate. Both sperm and eggs cells are released in the water where fertilization occurs.</span>
Answer:
Option (D)
Explanation:
Environment refers to all the living and non-living components that surround us. There occur various processes such as precipitation, evaporation, weathering and erosion, deposition, and the processes that are associated with the various cycles such as geochemical cycle, nitrogen cycle, carbon cycle, phosphorous cycle and so on.
These processes occur in all the regions on earth and at different rates, and they are comprised of energy that is constantly in the flow from one region to another. These environmental changes and the forces that are involved in it are dynamic in nature.
Thus, the correct answer is option (D).
They different because there made different and come from different resources
