Flowing-water ecosystems often alternate two different but related habitats: the turbulent ________ and the quiet pool
Fill in the blank(s) with correct word
riffle
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The reptile group most closely related to the birds is
the a. turtles. b. snakes. c. lizards. d. tuataras. e. crocodilians.
In an experiment designed to analyze the mRNAs present in a cell at a given time in the life cycle, it was found that about 50% of the mRNAs are of one type, less than 20% represent eight other mRNAs, and the rest consist of several thousand
different mRNAs. What does this information indicate? A) Only the mRNA expressed at the highest level is of any importance to this cell type. B) The pattern of expression of the low-level mRNAs is what makes the cell type unique. C) The low-level expressed genes are from organelles. D) Those genes expressed at a low level are likely to be "housekeeping" genes found in many cell types. E) The genes most specific to this cell type and life stage are the 8 found at an intermediate level.
The trade-off between investments in current reproduction and in growth that promotes future reproduction is referred to as the total cost of what?
A. genetic change B. fitness C. selection D. reproduction E. adaptation
The characteristic that sets plants apart from photosynthetic protists is the multicellular, dependent embryo
Indicate whether the statement is true or false