Which of the following elements cannot be utilized directly from the atmosphere by plants?
a. carbon
b. nitrogen
c. oxygen
d. phosphorus
B
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Which of the following germ layer-structure is mismatched?
A. mesoderm-notochord B. endoderm-lungs or respiratory tube C. ectoderm-epidermis D. mesoderm-digestive tract E. ectoderm-brain
A change in the genetic information of a cell; The ultimate source of genetic diversity; A mutation also can occur in the DNA or RNA of a virus
What will be an ideal response?
Natural colonization can happen in all of the following ways except
A. lowered sea levels connect two areas previously isolated. B. a flock of birds gets blown off course. C. birds pick up seeds on their feet while wading in mud and drop them elsewhere. D. a bird eats a fruit on the mainland and defecates the seed on an island. E. people plant new species on an island.
Why is self-reinfection commonly seen in children that suffer from pinworms?
What will be an ideal response?