Fill in the blanks Human activities have altered many natural environments by . Many lands are now fields where only one from farm crop is grown, an example of a (n) .

Other human activities had added many to the atmosphere some of which cause an ugly Haze called or damage the protective . A consequence of global transportation has been the spread of that outcompete or prey on native species.

Use these to fill in the blank:
Monoculture
Invasive species
Pollutants
Ozone layer
Smog
Deforestation

World class speed skaters can skate a 3,000-m course in about 4 minutes. what is their average speed for this course. a. 12.5m/s b. 1.33m/s c. 13.3m/s d. 1.25m/s

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.

Compare the shapes of the bones of the human skull with the shapes of the bones of the human leg. how do the shapes differ? why are the shapes important?