Answer: A Microtubules
Explanation: The cytoskeleton is composed of at last three different types of fibers: microtubules, microfilaments, and intermediate filaments. These fibers are distinguished by their size with microtubules being the thickest and microfilaments being the thinnest.
I think verterbrates have a back bone others do not. I only THINK so.
Answer:
Micronutrients helps in preventing the skin from different types of allergens or pollen which may result in skin rashes or hives. It protects skin againts various pathogens or fungi. It acts as anti oxidants on skin and thus prevents premature ageing. It also protects from harmful UV radiateion which damages DNA.
Explanation:
DNA, nucleosome, coils, supercoils, chromosome.
I would say D! Purely because it is looking at the effects of humans (therefore related to topics more geographical).
Hope that helps. :)
