Which of the following characteristics apply to all amphibians? (Choose all that apply) A. ectothermic
B. permeable skin
C. metamorphosis involving two or more distinct stages
D. lungs instead of gills

Imagine ? person stepping on a pin and pulling his or her foot way look at the réfléchir arc of the scenarios below

Select the correct answer from each drop-down menu. in an experiment, dr. travis examined the effects of calcium intake on osteoporosis, a condition that causes an increased risk of bone fractures. the amount of calcium is variable. the risk of bone fractures .

The transport tubes for food coming down the plants are called?