The internal skeleton of echinoderms is made of calcium-stiffened ____ that develop from mesoderm
a. ampullae
b. ossicles
c. radial canals
d. ring canals
e. madreporites
B
Biology & Microbiology
You might also like to view...
The H5N1 influenza killed more than 50% of those infected
a. True b. False Indicate whether the statement is true or false
Biology & Microbiology
Animal breeders use a _______ to determine whether an organism is heterozygous or homozygous for a particular trait.
a. Punnett square b. reciprocal cross c. test cross d. self cross
Biology & Microbiology
In flowering plants, pollen grains form in the
flower's male parts called
a. stamens. b. anthers. c. carpels. d. megaspores. e. endosperms
Biology & Microbiology
In DNA, the phosphate groups and the sugars are the outside of the double helix
a. true b. false
Biology & Microbiology