Who proposed the idea that many species that had once existed were now extinct?
1.Cuvier
2.Darwin
3.Lamarck
4.Wallace
1
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Which of the following relationships between groups is correct? Select all that apply
A. cephalopod are a group of annelid B. crustaceans are a group of arthropods C. insects are a group of hemichordates D. sea stars are a group of echinoderms E. tunicates are a group of chordates
Some combinations of recessive alleles cause problems so severe that a fetus may cease to develop. Such lethal allele combinations appear to alter Mendelian ratios because
A) carriers do not constitute a progeny class. B) they do not show a 1:2:1 genotypic ratio. C) homozygotes for the lethal allele do not appear as a progeny class. D) homozygotes for the lethal allele pass it on to half their offspring.
The end of floral shoot where a flower develops is called the ____
a. ovule b. calyx c. receptacle d. filament e. carpel
Once inside the human body, HIV primarily
infects a. liver tissue. b. kidney tissue. c. red blood cells. d. white blood cells. e. all of these.