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Sperm fertilizes an egg forming a ________ which becomes an________ and then a fetus.

Examples of species that needs to be nurtured (cared for) by their parents at birth: ________, ________, ________
Examples of species that does not need to be nurtured (cared for) by their parents at birth: ________, ________, ________

User Preckrasno
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Answer:

zygote

embryo

elephant,calf,penguin

frogs, snake, butterfly

User StasVo
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