A key innovation that helped sporophyte-dominant plants survive in high, dry environments is ____.
A. flagellated sperm
B. the cuticle
C. xylem
D. phloem
E. lignin
Answer: B
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Primary protein structure is dependent upon ____
a. hydrophobic interactions b. hydrogen bonds between two amino acids c. covalent linkages between carbons and nitrogens of adjacent amino acids d. covalent linkages between carbons and oxygens of adjacent amino acids e. covalent linkages between the polypeptide and sugars or lipids
what type of infection is Cipro used for?
What will be an ideal response?
Net primary ________ is the energy available to the heterotrophic component of the ecosystem
Fill in the blank(s) with correct word
The idea that older, more stable habitats have greater species richness than habitats subjected to frequent, widespread
disturbances is known as: a. natural selection. b. the time hypothesis. c. island biogeography. d. the theory of community stability. e. the disturbance hypothesis