Why is it helful to make the central ideas of the text to give you an. overview

to help you define

to learn additional details about the topic of the text

to help you read with greater focus on the text à Puppose​

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation:

b.transmitters send radio waves, and receivers capture radio waves.

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."

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