Bailey designed a science fair experiment to test the effect of different light sources on the growth of rose plants. To conduct the experiment, she placed one group of ten rose plants in front of a window, then placed another group of ten rose plants under a light foxture with a special light bulb for plants. What is the outcome variable (dependent variable) in this experiment?
O the number of rose plants
o the growth of the rose plants
o the different light sources used

Guide for the first time and the 30th of the month of July in a couple few months ago to

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.