Answer:
Leukopenia decrease the body's ability to fight infection.
Explanation:
White blood cells are responsible for protecting the body against infection disease and foreign invaders. If our body have fewer white blood cells, our immune system would have a harder time fighting off deadly diseases.
The tropical zone is always hot and humid.
The correct answer is option A, that is, Phylum Porifera.
The species of Phylum Porifera are aquatic, that is, mostly marine. They exhibit cellular grade of the body, they are diploblastic animals with asymmetrical symmetry. They lack body cavity and exhibits a holozoic mode of nutrition with intracellular digestion.
They lack circulatory and nervous system and possess the tendency to regenerate their parts of the body. The organisms in phylum Porifera exhibits both asexual and sexual mode of reproduction.
An animal that relies on a digestive tract for digestion breaks down food by "b) extracellular digestion <span>only" since digestion happens at all levels of the organism. </span>
