The cells of organisms found in the phylum Porifera (sponges) are not organized into tissues. What structures are absent in organisms belonging to the phylum Porifera? A. organelles

B. genes

C. organs

D. cells

Which spheres are involved when sedimentary rocks formed from parts of seashells at the bottom of the ocean? a.) biosphere, atmosphere, geosphereb.) geosphere, hydrosphere, biosphere c.) geosphere, exosphere, hydrosphered.) hydrosphere, biosphere, atmosphere

Located at the epidermal-dermal junction of the skin. select all true statements about the transformation of melanocytes into abnormal cell

Each member of a class sampled a piece of ptc testing paper. thirty people sampled the chemical. twenty persons were tasters. how many had heterozygous genes? 10 20 0-20 indeterminate