Fossils found in the lowest geological strata are generally the most

a. advanced.
b. complex.
c. primitive.
d. widespread.
e. specialized.


C

Biology & Microbiology

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How are protein-encoding genes in eukaryotes transcribed?

a. by RNA polymerase III b. by RNA polymerase I c. by RNA polymerase II d. by DNA polymerase

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The event called the Cambrian Explosion resulted in an abrupt increase in

A. volcanic activity. B. rate of continental drift. C. algal diversity. D. diversity of major animal groups. E. the number and size of glaciers.

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Compare and contrast the following pairs of related terms: gene and allele, genotype and phenotype, homozygous and

heterozygous. What will be an ideal response?

Biology & Microbiology

How far are most leaf cells from a xylem vein?

a. 2.0 centimetres b. 1.0 centimetre c. 0.5 millimetres d. 50 micrometres

Biology & Microbiology