Mitotic spindles are microtubule-based structures that separate chromosomes during mitosis. So the cell would lack structure.
The answer is D. Food Threshold is the amount of food capable on feeding the organisms.
True, our ecosystem is not independent. Everything depends on everything else to survive. :)
Your answer would be C. because the rest of potential energy. This one is not stored energy, it's kinetic.
Hope this helps; have a great day!
