Direct observation is an observation you make first hand. It is something you see with your own eyes and observe yourself.
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Function of
centrioles
An organelle that forms a
spindle-shaped structure of protein fibers on which the chromosomes move during
nuclear division are called the centrioles. Centrioles are part of the animal
cell organelles. Hence, they are a small part of the microtubules organized and
set in a particular course. Microtubules include 9 sets. Centrioles contain a
cylindrical structure, packed with protein which is described as tubulin. Found
mostly in eukaryotic cells beside the nucleus.
The stomata (or singular, stoma) diffuse carbon dioxide and oxygen through the plant, taking in CO2 and producing O2 for us the breathe.
B. oxygen is the final step
