Which statement is true concerning visible light and the electromagnetic spectrum?
All electromagnetic radiation is considered to be
visible
b
Visible light is not part of the electromagnetic
spectrum
Visible light is a large portion of the
electromagnetic spectrum
d
Visible light is a small portion of the
electromagnetic spectrum,

D

Explanation: visible light makes up only a very very, very small portion of the entire electromagnetic spectrum

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.

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times