Acertain type of hummingbird is known to have an average weight of 4.55 grams. a researcher wonders if hummingbirds (of this same type) living in the grand canyon differ in weight from the population as a whole. the researcher finds a sample of 30 such hummingbirds from the grand canyon and calculates their average weight to be 3.75 grams.

Texas bluebonnet plants seen in this photo are an example of which ecological unit?

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. there has been much debate about the classification of these creatures. some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards.the data equally support both cases. which statement best explains how to draw a cladogram that includes the rynchosaur? draw the cladogram for amphibians. draw the cladogram for reptiles. draw two cladograms, both showing the traits, and leave it as a hypothesis. draw two cladograms, both showing the traits, and have scientists vote

Which coal field location is related to coal fields in the eastern united states and supports the theory of continental drift? eastern india southern africa western australia northern south america