Ryan is looking at a cell under a microscope, he observes formation. he observes spindle microtubules from the centrosomes. which phase of the cell cycle is he observing?

a: metaphase.

b: anaphase

c: prophase

The right option is C: prophase

Prophase is the phase of the cell cycle Ryan is observing.

Prophase is the first stage of mitosis during which the chromatin condenses to form the visible chromosomes. Also, a structure known as mitotic spindle which is composed of long proteins (microtubules) begin to form from the opposite ends of the cell (centrosomes) and a part of the nucleus where ribosomes are produced disappears during this phase.

not only is it colder, it also becomes darker, less salty, and more dense.

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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.