In terms of human evolution, the sagittal crest was usually more pronounced and larger in older and robust species compared to younger or gracile species.
Hope that helped! :)
Answer:
Because of the chemical and structural nature of the phospholipid lipid by layer the lipid soluble molecule can just pass the lipid membrane and some small molecules can also pass freely.
Explanation:
as we know that the homeostasis is an important process for a living cell to maintain it self so for the the exchange of materials between the external and internal environment is must so for that it exchange material with the outside environment of the cell.as the cell membrane is semipermeable(mean allow some molecule to pass(lipid soluble) and not others(lipid non soluble) to pass through the membrane.the cell membrane is selectively permeable due to its nature and chemical composition the chemical composition is lipid and phosphate and glycerol(head) with fatty acid that may b saturated or unsaturated(tail).so finally all those molecule which are polar can not pass through the membrane and non polar can pass the membrane.The size of the molecule is also a factor on which the permeability depends.
In the capillaries, hydrostatic
pressure (HP) is exerted by blood that is often
measured for diagnosis since it is closely related to the force and rate of the
heartbeat and the diameter and elasticity of the arterial walls. The net hydrostatic pressure (HP) is the
hydrostatic pressure in the capillary minus hydrostatic pressure in the interstitial
fluid.
