How do lymphatic capillaries differ from blood capillaries?

a. fluid flows in one direction in lymphatic capillaries.
b. lymphatic capillaries are dead-end tubes.
c. the walls of lymphatic capillaries are composed of endothelium.
d. lymphatic capillaries are highly permeable.

b.Lymphatic capillaries are dead-end tubes.  

d.Lymphatic capillaries are highly permeable.

Explanation:

Lymphatic capillaries transport lymph that flows with little pressure, these capillaries are made of endothelium, are blind-ended (closed at one end) and are more permeable than the blood ones because they serve to drain extracellular fluids.

Blood capillaries, on the other hand, transport blood, that contrary to lymph, flows with more pressure, their walls are also made of endothelium but they are less permeable and conform a circuit, meaning they have no dead ends.

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1. the geologists have established a set of principals that can can be used o determine the relative ages of rock. this principal is applied to sedimentary and volcanic rocks. the rocks exposed to wall of grand canyon has layers and by studying the number of horizontal layers in the rock(strata) the relative age can be determined. the layer first formed will appear at the bottom and the the layer of strata last formed appear at the top. by using this information the approximate age of rocks can be determined.

2. carbon dating is used to find the relative age of rock in numbers which means for the rocks that has age between 1-70,000 years.

3. for the rocks of age range between 1,000 - billion of years potassium-argon dating is used.