Question

most bird species that are capable of flight weigh less than a kilogram (kg), which is not surprising considering the burden that extra body weight puts on a flying animal. but not all flying birds are so light, as we can see most clearly in the example of the ___. which choice most effectively uses data from the table to complete the example? a mute swan, which has an average mass of 11.9 kg. b andean condor, which has an average mass below 10 kg. c somali ostrich, which has a higher average mass than the dwarf cassowary. d somali ostrich, which has an average mass of 90.0 kg.

Explanation:

We are given the average masses of different bird - species in a table and need to determine which can fly based on the criterion of flight - weight being less than 1 kg. The Andean condor and mute swan have average masses less than 10 kg and are marked as 'Yes' for flight - capable in the table. The Somali ostrich and dwarf cassowary are marked as 'No' as they are much heavier. Comparing the options, we check the mass values and flight - capability status.

Answer:

A. mute swan, which has an average mass of 11.9 kg.
B. Andean condor, which has an average mass below 10 kg.
C. Somali ostrich, which has a higher average mass than the dwarf cassowary.
D. Somali ostrich, which has an average mass of 90.0 kg.