Yes it is alive . It respires , photosynthesizes and grows . It reacts to stimuli ( sunlight ) and tries to survive by adapting to the environment . Its' billions of cells form into transport vessels , roots , leaves and other structures to facilitate the creation and use of energy .
I would say the growth, the repair, and the reproduction.
Answer is B. Porifera
Members of the phylum porifera includes animals which lack tissues. These animals are also called sponges. These are the simplest multicellular animals. Even though they are multicellular, they do not have any tissues or organs. They have cellular level of body organization. Sponges are aquatic animals and water plays a major role in the feeding, exchange of gases and as well as excretion.
The answer is because aerobic and anaerobic respiration to give us energy.<span />