Answer:
Gastrulation takes place after cleavage and the formation of the blastula and the primitive streak. It is followed by organogenesis, when individual organs develop within the newly-formed germ layers. Each layer gives rise to specific tissues and organs in the developing embryo.Cells in each germ layer differentiate into tissues and embryonic organs. The ectoderm gives rise to the nervous system and the epidermis, among other tissues. The mesoderm gives rise to the muscle cells and connective tissue in the body. The endoderm gives rise to the gut and many internal organs.
<span>Classification systems change over time for a variety of reasons, but the basic gist of the matter is that as we learn more about the natural world around us, these systems change to fit in with and around the new information. Whilst it is worth learning the current system of classification, it is also important to remember that this could always change at any time.</span>
Answer: C) Prokaryotes convert nitrogen-containing molecules into forms that can't be used by other organisms.
Prokaryotes are the organisms that do not have a membrane bound nucleus, mitochondria and other organelle. They ranges in size of diameter from 0.1–5.0 µm.
Example:<em> Escherichia coli, Sulfolobus acidocaldarius archeobacterium </em>
Decomposers, play an important role in nitrogen cycle. Nitrogen gas is converted to nitrate compound by nitrogen fixing bacteria which are present in root nodules of leguminous plants.
Example: <em>Azotobacter </em>
Hey Gary!~ C: Disruptive selection is the correct response, and the graph displayed has the typical shape of a population that has undergone this type of selection. Good luck on your exams! (✿◕ ‿◕ฺ)ノ))。₀: *゜
Hydrogen atoms in compounds such as h2 and H2o are joined to the molecules with covalent bonds. This is where electrons are shared between the atoms in order to fill there valence shells.
As we mentioned before, hydrogen can only form one covalent bond because its 1s electron orbital holds a maximum of two electrons. Hydrogen can form either a polar covalent bond or a non polar covalent ( cause there is no electronegativity difference between the two molecules).
Water contain polar covalent bonds because the oxygen has a grater electronegativity than the hydrogen atom.
