The osmoregulatory/excretory system of a freshwater flatworm is based on the operation of _____
A) protonephridia
B) metanephridia
C) Malpighian tubules
D) nephrons
A
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Which layer of the endometrium is the functional layer and what does it do?
A. the outermost layer, basal layer of reproducing cells B. the innermost layer, grows in thickness during the uterine cycle C. the outermost layer, grows in thickness during the uterine cycle D. the middle layer, sheds frequently to maintain a healthy lining for implantation E. the innermost layer, basal layer of reproducing cells
All of the following are true about bryophytes EXCEPT
A. they are now the most abundant plant group on land. B. they can be found from the Antarctic to the tropics. C. they erode rocks to produce soil. D. they produce peat that can be used as fuel.
When a sodium atom and a chlorine atom interact to complete their valence shells
A. they form 1 polar covalent bond B,. an electron is transferred from sodium to chlorine, turning the sodium atom into an anion and the chlorine atom into a cation and allowing the two atoms to form an ionic bond C. an electron is transferred from sodium to chlorine, turning the sodium atom into a cation and the chlorine atom into an anion and allowing the two atoms to form an ionic bond D. they form 2 polar covalent bonds
Hans Spemann has referred to which of the following structures as the primary organizer in the early development of amphibian embryos?
A) optic cup B) notochord C) neural tube D) dorsal ectoderm E) dorsal lip of the blastopore