Cell theory was first proposed in 1838. Evidence obtained through additional scientific investigations resulted in the current cell theory. Which statement describes a component of the original cell theory that was removed because of the new scientific knowledge?
A. All living things are made of cells.
B. All cells come from other preexisting cells.
C. Cells form through spontaneous generation.
D. Cells are the basic structural and functional units of life.
C. Cells form through spontaneous generation.
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The male pine cone
(a) produces pollen. (b) contains a female gametophyte. (c) bears a megasporangium containing a megaspore mother cell. (d) gives rise to a seed.
Which system is directly involved with heat
production? a. endocrine system b. nervous system c. muscular system d. respiratory system e. skeletal system
Examples of invasive species include ________
A) kudzu and red-cockaded woodpeckers B) cod and Chilean sea bass C) snowshoe hares and kudzu D) cheatgrass and Burmese pythons
Animals such as cats, worms, and butterflies are classified as:____
Fill in the blank(s) with the appropriate word(s).