One hot summer day, Thomas left a glass full of water outside. When he went back to get it the next day, half the water was gone. What type of interaction within the Earth’s system was this?

A) Lithosphere-Biosphere
B) Hydrosphere-Biosphere
C) Atmosphere-Lithosphere
D) Hydrosphere-Atmosphere

D) Hydrosphere-Atmosphere

Explanation:

The water in the glass evaporated, moving from the glass to the atmosphere. This is a hydrosphere-atmosphere interaction.

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.

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