Answer:
Ralph is looking at a vein (likely a muscular vein).
Explanation:
Of all three great types of vessel present in vertebrates (arterial, venous, lymphatic), only veins and lymphatic vessels may normally contain valves. This is an essential feature of vessels which present low pressure flow, since it ensures that such flow is unidirectional.
Since blood cells are not typically found in lymphatic vessels, the vessel in question can be assumed to be a vein.
Answer:
skin it protects from germs
1.Scaly skin. This keeps the animal from losing too much water to the environment.
2. <span>Shelled
amniotic egg. This allows the egg to incubate on land without drying
out, allowing the adults greater range on land than would be the case if
they had to return to water to lay eggs. </span>
Explanation:
Blood sugar, or glucose, is the main sugar found in blood. The body gets glucose from the food we eat. This sugar is an important source of energy and provides nutrients to the body's organs, muscles and nervous system.
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