Answer:
Cnidarians represent a more complex level of organization than Porifera. They possess outer and inner tissue layers that sandwich a noncellular mesoglea. Cnidarians possess a well-formed digestive system and carry out extracellular digestion.
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HIV tests are used to detect the presence of the human immunodeficiency virus
(HIV) the virus that causes acquired immunodeficiency syndrome (AIDS) in serum, saliva , or urine such tests may antibodies, antigens, or RNA .
I and III.
Chargaff's law and Rosalind Franklin's discoveries
The actually speed of sound in water is 1,498, which is closest to 1,500 meters per second.
-Steel jelly
I believe that the answer would be B.the realized niche
