Answer:
D) is the correct answer in my opinion
The answer is d. pheromones.
Its D) UGCUGC because this sequence is the mrna if it was the dna sequence it'd be B but its definetly D
The answer is single opening. The gastrovascular cavity varies from the alimentary canal in that only the gastrovascular cavity has only a single opening. In addition, an alimentary canal has two openings and food moves over it unidirectional. The gastrovascular cavity is a construction establish in primitive animal phyla. It is accountable in cooperation with the digestion of food and the transportation of nutrients all over the body.
