Can you put this in order from smallest to largest? the list is: chromosome, gene, organ system, tissue, organism, organ, nucleus, nucleotide base pair, cell.

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

The polio virus can cause skeletal muscle paralysis by destroying neuron cell bodies. what area of the spinal cord is destroyed