The leaves of ginkgo trees are unique because they have
A. unbranched veins.
B. forked veins.
C. multiply branching veins.
D. veins in a netlike pattern.
E. veins only around the edges.
B. forked veins.
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Which group of terms is in the correct developmental sequence?
(a) microspore mother cell, meiosis, megaspore, female gametophyte. (b) microspore mother cell, meiosis, microspore, pollen grain. (c) megaspore, mitosis, female gametophyte, meiosis, endosperm mother cell. (d) all of the above.
The collection of genes and the corresponding alleles is a population's
A. recessive traits. B. genotype. C. gene pool. D. phenotype. E. dominant traits.
What macromolecule is composed entirely of beta-glucose units?
a. starch b. chitin c. glycogen d. cellulose e. protein
The energy required for photosynthesis to occur is
A) visible light. B) ultraviolet light. C) air. D) oxygen. E) glucose.