In conifers, microspores develop into
A. flagellated sperm.
B. pollen grains.
C. ovules.
D. a nucellus.
E. male cones.
B. pollen grains.
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The nitrogenous waste that requires the most energy to produce is _____
A) ammonia B) ammonium C) urea D) uric acid
_______________ is a human hereditary disease that is caused by a dominant allele but does not show up in affected individuals until they are in middle age.
A. Cystic fibrosis B. Sickle cell anemia C. Tay-Sachs disease D. Huntington's disease E. Hemophilia
All protists are unicellular organisms
Indicate whether the statement is true or false
After much study, ecologists have come to the conclusion that competitive exclusion
A. occurs rather frequently in nature. B. occurs more frequently in tropical habitats than temperate ones. C. occurs very rarely in nature. D. occurs more frequently on islands than on the mainland.