According to the phylogenetic tree, which two phyla are most closely related?

a. chordata and mollusca
b. cnidaria and nematoda
c. annelida and arthropoda
d. platyhelminthes and echinodermata

Annelida and Arthropoda are the correct answers (C)

The correct answer is option C, that is, Annelida and Arthropoda.

Explanation:

A diagram, which demonstrates an evolutionary association between the species is known as a phylogenetic tree. Both the phyla, that is, Annelida and Arthropoda belong to the kingdom Animalia. In both the phylum, the species comprises of segmented bodies. However, the species belonging to phylum Annelida comprises a hydrostatic skeleton, while the species in phylum Arthropoda comprises exoskeleton formed of chitin.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

lysosome is this part of the cell is surrounded by a very thick outer membrane to protect the rest of the cell from its strong enzymes.