Answer:
C. Age of Mammals
Explanation:
Cenozoic is derived from Greek word meaning NEW LIFE. The Cenozoic Era witnessed the disappearance of Dinosaurs which made Mammals to thrive and giving a new life to mammals. During this early stage as new life is beginning, majority of the animal species are relatively small comprising of the small mammals, birds, reptiles and amphibians.
The plasma membrane of the sea urchin egg has receptor molecules that are specific for binding acrosomal proteins .
<h3>What is plasma membrane ?</h3>
Plasma membrane is the outermost covering of the body which selectively permits the entry and exit of different type of materials .
Thus ,it is also called as selectively permeable membrane.it also separates the inner and outer environment of the cell .
It also helps in the diffusion process .
<h3>What are sea urchins ?</h3>
Sea urchins belongs to the animalia kingdom , Echinodermata Phylum, and Echinoidea class . they are small marine animals .Sea urchins are spiny , globular .
Learn more about sea urchins here :
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Answer: The aorta
Explanation: the main blood supplier to the body branches off into two main coronary blood vessels (also called arteries). These coronary arteries branch off into smaller arteries, which supply oxygen-rich blood to the entire heart muscle.