Which of the following will cause a decrease in the mass of an object? A. Increase in the gravitational pull B. Decrease in the gravitational pull C. Increase in the quantity of substance present in the object D. Decrease in the quantity of substance present in the object

Increase the amount of matter present in the object

Explanation:

The mass of an object is a measure of the amount of matter present in the object. Mass is independent of the gravitational field strength; the dependency on gravitational field strength is that of weight. The other property characteristic to matter is the amount of space it occupies, also known as its volume. The ratio of these properties of matter, mass over volume, produces a characteristic property called density.

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.