Which of the following BEST represents competition among organisms? A. a walking stick insect resembling its environment

B. zebras staying together in groups to avoid predators

C. different types or species of trees trying to obtain sunlight and water

D. a cheetah hunting and killing a gazelle for food

If someone could do the first couple, just so i can see how it's done that would be great! 20 points. complete a dichotomous key for the 10 leaves on the common leaves sheet. the chart provided here allows for 11 pairs of statements. depending on how you build your dichotomous key, you may or may not need all of them, or you may need to add some.

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

Which list shows the levels of organization of an organism in hierarchical order from left to right, from the smallest to the most complex?