The primate fossil named Lucy was
a. a dryopith.
b. an australopith.
c. a cercopith.
d. a prosimian.
e. none of these
B
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The Cambrian explosion refers to Earth's historical benchmark of life involving the
A. appearance of fossils for all major phyla of animals. B. origination of life, when the progenotes formed the first cells. C. All of the answer choices are correct. D. mass extinction of the nonavian dinosaurs. E. development of the first multicellular organisms.
. In a majority of land ecosystems, most energy in producers flows directly to ____
a. decomposers b. other plants c. detritivores d. herbivores e. carnivores
Reductionism refers to the method of investigating structures by:
a. studying the whole. b. studying emergent properties. c. reducing our knowledge about these structures. d. studying the parts of the structures. e. studying many structures together.
Sperm cells are formed in plants by _____
A) meiosis in pollen grains B) meiosis in anthers C) mitosis in male gametophyte D) mitosis in the micropyle