When fighting to protect the Grand Canyon, Teddy Roosevelt wrote: "I want to ask you to keep this great wonder of nature as it now is... You cannot improve on it. The ages have been at work on it, and man can only mar it." In what class of ecosystem services is society's aesthetic appreciation of wild systems?

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Which of the following is an example of competition that could be found in a forest? question 14 options: deer eat berries and their droppings seed new areas creating more berry bushes two fox populations utilize the same rabbit population as their main food source two hawk populations utilize the same scorpion population as their main food source lack of sunlight due to changes in the seasons restricts the growth of certain plants

What is the term for the two sets of chromatids formed in the parent cell a.haploid b.diploid c.gamete d.tetrad