Question

50 multiple choice 10 points
which of the following is not a shared characteristic of all chordates?
○ pharyngeal gill slits
○ postanal tail
○ four - chambered heart
○ notocord
51 multiple choice 10 points
homeostasis refers to the tendency to keep body systems...
○ matched to the external environment
○ the same relative to one another
○ in a steady state over time
○ under the control of the brain

Explanation:

Question 50

Chordates have four key characteristics at some stage: notochord, dorsal hollow nerve cord, pharyngeal gill slits, and post - anal tail. A four - chambered heart is not a characteristic of all chordates (e.g., fish have a two - chambered heart, amphibians and most reptiles have a three - chambered heart).

Homeostasis is the process by which an organism maintains a stable internal environment. It is about keeping body systems in a steady state over time, not about matching to the external environment, the relative sameness of systems to each other, or being under the brain's control (though the brain is involved in regulation).

Answer:

C. four - chambered heart

Question 51