21. Two factors which cause global climate change are listed below. Factor 1: Mountain building.
Factor 2: Changes in the amount of atmospheric gases.
Which of these statements is correct about the two factors which cause global climate change? (3 points)
Factor 2 is a natural factor and Factor 1 is influenced only by human factors.
O Factor 1 is a natural factor and Factor 2 is influenced only by human factors.
Factor 1 is a natural factor and Factor 2 may be influenced by both nature and human factors.
Factor 1 is a human induced factor and Factor 2 may be influenced by both nature and human factors.

What is usually (but not always) related to the metabolic processes of living organisms in its organic form?

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.

What organs comprise the respiratory system of a bird