The skeletal elements that give support to a sponge's body are called
a. choanocytes.
b. spongin.
c. spicules.
d. collar cells.
e. porocytes.
C
You might also like to view...
The expression of the lac operon in an E. coli cell missing the gene that encodes for the lac repressor:
A. will increase when lactose is present. B. will decrease when lactose is present. C. will decrease when glucose is present. D. will increase when glucose is present.
In plants, most chloroplasts are inherited from the maternal plant because maternal gametes contribute the most __________ to the zygote.
A. cytoplasm B. mitochondria C. ribosomes D. chlorophyll E. cytoplasm and mitochondria
Huntington disease is _____
a. a model of a multifactorial trait, controlled by several genes b. inherited as an X-linked dominant trait c. a disease with onset in early childhood d. one that produces no significant changes in brain cells e. a model of a single gene defect affecting behavior
You are studying a newly-established nature preserve, and find that the biomass of herbivores within it is 10 kJ/m2. Based on the graph below, what would you predict about the primary productivity of the area relative to other ecosystems?
A. It would be higher than tundra, but lower than savannah. B. It would be higher than savanna, but lower then tropical forest. C. It would be higher than savannah, but lower than temperate forest. D. It would be higher than desert, but lower than tundra.