The organism show a free- living one that is anchored to the bottom of ponds and streams during the first part it is life cycle. what is the common name of a group to which this organism belongs? plz asap

a. comb jellies

b. arthropods

c. cnidarians

d. echinoderms

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water.b. they use chlorophyll and oxygen to make carbon dioxide and water.c. they use sunlight, water, and carbon dioxide to make sugars.d. they use sunlight, water, and oxygen to make chlorophyll.

Why do the circulatory systems of land vertebrates have separate circuits to the lungs and to the rest of the body?

Which factor is difficult to assess in a cost-benefit analysis