The diagram below shows a portion of the geologic time scale. Based on the time scale, it can be concluded that

A. animals appeared on Earth before flowering plants.
B. land animals created the first oxygen molecules.
C. flowering plants appeare on Earth before animals.
D. flowering plants created the first oxygen molecules.

Creation of an unnaturally uniform sample to represent a diverse populationcan be avoided by: a. including only willing b. asking another scientist for .c. choosing only identical participants.d. selecting individuals at random.

Residential construction is expanding in florida, the expansion has caused fragmentation of habitats, one of the results of the increased construction is a decrease in the number of large predators such as the coyote, black bear and pool panther, which will be the most immediate local result of this fragmentation? 1)large predators will become extinct 2)decrease in middle sized predators 3)increase in population of top carnivores 4)increase in population of prey species

Several billion years ago which gas was the least prevailant in the atmosphere