Who proposed the idea that many species that had once existed were now extinct?

1.Cuvier
2.Darwin
3.Lamarck
4.Wallace


1

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

The end of floral shoot where a flower develops is called the ____

a. ovule b. calyx c. receptacle d. filament e. carpel

Biology & Microbiology

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.

Biology & Microbiology