A sudden increase in diversity of many animal phyla was seen in the ____ period
a. cambrian
b. permian
c. devonian
d. ediacaran
e. cretaceous
Ans: a. cambrian
Biology & Microbiology
You might also like to view...
When does crossing over occur?
A. Meiosis I B. Cytokinesis C. Meiosis II D. Mitosis
Biology & Microbiology
After microRNAs are transcribed, processed, and folded into stem-and-loop hairpin structures, specialized enzymes cleave the miRNAs to double-stranded fragments that are typically around 20-25 nucleotides long
A. true B. false
Biology & Microbiology
A _________ is a circular or U-shaped ridge around the mouth, bearing either one or two rows of ciliated, hollow tentacles.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
Paired homologous chromosomes are found at
the center of the cell during
a. metaphase I. b. telophase I. c. prophase II. d. metaphase II. e. more than one of these
Biology & Microbiology