<span>The amount of goods and services produced by an economy divided by the amount of resources used to make those goods and services, measures economic D. productivity.</span>
Answer:
In some ways, monotremes are very primitive for mammals because, like reptiles and birds, they lay eggs rather than having live birth. In a number of other respects, monotremes are rather derived, having highly modified snouts or beaks, and modern adult monotremes have no teeth.
Answer:
The primary species something regenerates off of.
For example: Let's say there was an animal called a goblegg.
If the animal who gives it the main components is an chicken, the primary species is a chicken.
Hope this helps!
B is the most efficient answer
Answer:
The circulatory system consists of the heart, the arteries, veins, and capillaries.
Explanation:
