D. the moveable and proximal attachment
<span>The female frog's reproductive system is consist of a pair of ovaries and a pair of oviducts. The ovaries are attached to the kidneys. The kidneys carry countless ova which are released to outside through the oviducts. </span><span>In the breeding season, the male and the female frogs enter into a temporary union called amplexus. The male holds the female, presses her trunk and thereby forces the female to release the eggs, the male frog then releases the sperms immediately to bring about exterior fertilization.</span>
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https://www.wiley.com/college/boyer/0470003790/structure/tRNA/trna_text.htm
Explanation:
radius is 8 because radius is half of a diameter
The answer is fusion of gametes via fertilization.
