All of the following are evolutionary trends in the development of nervous systems for bilaterally
symmetrical animals except:a.
an increased number of neurons.
b. concentration of neurons.
c. specialization of function.
d. simplistic synaptic contacts allowing integration.
e. cephalization.
D
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Genes that code for transcription factors that bind regulatory sites on DNA are called
a. ideotic genes b. homeobox c. Hox genes d. homeotic genes e. homeodomains
What is the agricultural significance of root nodules on plants?
1.The nodules help hold soil in place so there is less erosion.
2.The nodules place nitrogen in the soil, so that less fertilizer is required.
3.The nodules increase the surface area of the root for water absorption, so less irrigation water is needed.
4.Root nodules would play no role in agricultural plants.
All echinoderms are found:a
in marine habitats. b. in freshwater. c. on land. d. on the bottom of the ocean or lakes. e. in shallow ocean waters.
Fungi contact and absorb food through the ________, a branching network of ________
A) mycelium; hyphae B) hyphae; mycelia C) mycorrhiza; mushrooms D) mushroom; hyphae