Answer: D. neuron
Explanation: Neurons are cells in the nervous system that are responsible for carrying messages by utilizing an electrochemical process.
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Answer:
Implantation is what leads an egg to pregnancy. If implantation doesn’t occur then, the fertilized egg comes out with period blood. After fertilization, the egg undergoes series of divisions called cleavage. The cells remain enveloped in the protective egg membrane. This membrane layer hardens after entry of sperm.
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Objective is to complete as many curl-ups as possible up to a maximum of 75 at a specified pace. ... When performing the curl up students need to get their backs up off the mat far enough so that their fingertips cross the measuring strip.
D. Large intestines
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