The water-vascular system is used primarily for:
a. excretion of excess water
b. locomotion
c. respiration
d. circulation
e. sensation
b
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Which species might experience reproductive isolation if all bees in the area were eliminated by disease?
a. brown bats b. coffee ferns c. almond trees d. dragonflies
Which of the following statements about Archaeopteryx is FALSE?
A. It is the ancestor of modern birds. B. It shows a combination of reptilian and bird -like features. C. It provided clear evidence of the close relationship between birds and dinosaurs. D. It had a long, bony, reptilian tail. E. It had asymmetrical feathers like a modern bird.
The fact that salt dissolves in water is best explained by the
A) slightly charged nature of water molecules. B) ionic nature of water molecules. C) hydrophobic nature of the water. D) hydrophobic nature of salt. E) polar nature of water molecules.
Which element is considered a micronutrient needed by plants?
A. Carbon B. Hydrogen C. Nitrogen D. Magnesium E. Zinc