do nesting birds take care of their young?
Ever seen a picture of a parent bird bringing worms or insects to the nest?
Now what do you think is the answer?
Egg-laying land animals have evolved to produce eggs with tough shells to ensure that
A .external fertilization can take place.
B.the egg and sperm can fuse
C.parental care is unnecessary***
D.
the developing embryo does no dry out
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