Constipation and diarrhea, are both caused by a similar thing. Constipation is caused whenever there is too much buildup of food, or other food based material in the intestines. Usually this passes itself, yet constipation can also cause diarrhea through a bowel movement.
Answer:
Allopatric speciation
Explanation:
Speciation is the gradual process by which two different species are formed from a single species due to evolution.
Allopatric speciation will occur when the speciation is due to geographical isolation of a species to the extend it prevents or interferes with the gene flow. Therefore, the populations can not mate with each other and they evolve separately.
This is what happened to the fox species when they were separated by a mountain range.
Functions of cell surface Receptors .
most ligands responsible for cell-cell signaling ( including neurotransmitters, peptide, hormones, and growth factors) bind to receptors on the surface of their target cells.
Sugar-Phosphate and hydrogen bonds
1. Tropisms are directional movements or growth response of a plant to the stimulus. In nastic movements, the response of the plant is non-directional. An example of tropism is thigmotropism, which is a growth response to the touch stimulus.
2. Nyctinasty is the nastic movement of plant parts such as leaves and petals in response to darkness.
3. Thigmonasty is a form of nastic movement (of a plant or a fungus) as a response to touch or vibration.
