Question

1. which of the following is characteristic of all birds?

autotrophic
endothermic
aquatic
invertebrate

Explanation:

• Autotrophic organisms produce their own food; birds eat other organisms, so they are heterotrophic, not autotrophic.
• Endothermic means an organism can maintain a constant body temperature internally, which is true for all birds (they are warm-blooded).
• Aquatic describes organisms living in water; many birds are terrestrial or aerial, so this is not universal.
• Invertebrates lack a backbone; all birds have a backbone, so they are vertebrates, not invertebrates.

Answer:

endothermic