Cotyledons develop into
a. leaves.
b. roots.
c. stems.
d. all of these
A
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Bacterial resistance to penicillin began to appear
a. several decades after its first use. b. 100 years after its first use. c. after the drug supply was largely from synthetic sources. d. during the AIDS outbreak in the 1980s. e. within a few years of its introduction into general use.
The class __________ includes Lumbricus terrestris, the common earthworm
A. Oligochaeta B. Polychaeta C. Polyplacophora D. Hirudinea E. Malacostraca
The leaves of a plant are the main organs where photosynthesis occurs. Which of the following best describes how their structure is related to this function?
A) Most leaves contain all the structures that the plant requires to reproduce. B) Leaves are covered by a waxy cuticle that prevents water loss. C) The leaves are covered with tiny hairs that allow for more water absorption. D) Most leaves are broad and flat to absorb maximum sunlight.