There is a __________ flow of energy into and out of an ecosystem, and a cycling of materials among
resident species. Fill in the blank(s) with the appropriate word(s).
one-way
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The negative subatomic particle is
a. the neutron. b. the proton. c. the electron. d. both the electron and the proton. e. both the proton and the electron
Which is the dominant structure during the life cycle of a fern?
1.gametophyte
2.sporophyte
3.archegonium
4.sporangium
Crossing over in prophase I and ________ in metaphase I increase the genetic variation from one generation to another
Fill in the blank(s) with correct word
Anaphase II is essentially the same as mitotic anaphase except that in anaphase II ________ and in mitotic anaphase ________
A) the cells are diploid... the cells are haploid B) chromosomes line up double file in the middle of the cell... chromosomes line up single file in the middle of the cell C) crossing over occurs... crossing over does not occur D) the cells are haploid and sister chromatids separate... the cells have the same number of chromosomes as the original cell and sister chromatids separate