The oldest known megafossils of early vascular plants may be characterized as:
a. possessing dichotomously branched stems with leaves.
b. possessing dichotomously branched stems without leaves or roots.
c. possessing erect stems with megaphylls.
d. possessing roots but lacking sporangia.
e. lacking roots but possessing megaphylls.
B
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Four of the five answers listed below are parts
of a leaf. Select the EXCEPTION.
a. stoma b. cuticle c. mesophyll d. pith e. petiole
In a centrifuged blood sample, which layer contains the red blood cells?
1.Hematocrit
2.Leukocytes
3.Plasma
4.Platelets
By definition, geometric isomers are mirror images of each other
__________________Indicate whether the statement is true or false.
Your best friend sneaks up behind you and lightly strokes the back of your neck with a feather. Which of the following receptors would detect this type of stimulus?
A) Pacinian corpuscles B) Hair cells C) Meissner's corpuscles D) Ruffini corpuscles E) Stretch receptors