When 1 carbon atom combines with 2 oxygen atoms, the resulting substance is called a(n) . A. The chemical symbol is always a single letter.
B. The chemical symbol always starts with the same letter as the name of the element.
C. The chemical symbol always begins with a capital letter.
D. The chemical symbol can be shared by more than one element.

Can you identify which of the following groups of organisms are, or are not, populations? a. the american bison (bison bison) and grey wolves (canis lupus) currently living in yellowstone national parkb. all of the rainbow trout (oncorhynchus mykiss that) that have ever lived in lake eriec. the group of american bison (bison bison) currently living in yellowstone national parkd. a group of calliope hummingbirds (selasphorus calliope) and a group of rufous hummingbirds (selasphorus rufus) living in the same new hampshire woodse. the northern cardinals (cardinalis cardinalis) living on opposite shores of lake champlain f. all of the whales currently living in the atlantic ocean off cape cod, massachusetts

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

Below, the levels of organization in a multicellular organism are shown from least to most complex. which level of organization can be described as several different types of tissues working together to perform a common task?