What characteristic is shared by birds, salamanders, and sharks?
a. lungs
b. endothermy
c. four limbs
d. jaws and paired appendages

(im pretty sure its not a or b but idk)

What’s the student’s scientific question

Astudent completed a lab report. which correctly describes the difference between the “question” and “hypothesis” sections of her report? “question” states what she is asking, and “hypothesis” states the result of her experiment. “question” states what she is asking, and “hypothesis” states what she thinks the answer to that question is in “if . . then . . because” format. “question” describes what she is trying to find out, and "hypothesis" states the procedures and methods of data collection. “question” describes what she is trying to find out, and “hypothesis” states any additional information or prior knowledge about the question.

If a keystone species is removed from an ecosystem