Me, i need this as soon as possible. what are organelles? describe the role of two organelles within the cell.

Organelles are specialized subunits within a cell that have specific functions. They are usually separately enclosed within their lipid bilayers.

Mitochondria- They have their own single-stranded DNA, which means they can self-replicate. They produce the "energy currency" of the cell, ATP. They do that through respiration, and do so in order to help regulate cell metabolism.

Lysosome- They are polymorphic organelles. Their function is to digest food in the cell, digest cell parts ( a process called autophagy, where it basically eats parts of itself, and re-makes itself from the inside out), and to break down extracellular matter ( again, when it's shedding, and re-modeling its tissue matter)

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i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

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5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000