An egg developes to a new into a new animal after its fertilized by the male reproductive cell or sperm. No matter how an animal reproduces its eggs it must provide ways or nourishing and protecting the developing embryo. Have a great day hope this helps you :)
The two-layered sac surrounding the heart is the pericardium.
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Answer:
D i think would be the best answer my studie in this part of health is low
