What does it mean when we say that dna replication is semiconservative? a. nothing in the dna is ever changed. b. the daughter cell receives the old dna while the parent cell gets a new copy. c. the daughter cell receives the new copy while the parent cell keeps the old dna. d. each old strand is used as a template for a new strand for the daughter cell.

D. Each old strand is used as a template for a new strand for the daughter cell.

Explanation:

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.