MCQ
Ecosystem creates :
- AFood chains
- BBoth of these
- CFood web
- DEcological pyramid
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Assertion $A$: Endometrium is necessary for implantation of blastocyst.
Reason $R$: In the absence of fertilization, the corpus luteum degenerates that causes disintegration of endometrium.
In the light of the above statements, choose the correct answer from the options given below: