Which is a correct relationship between soil particles and soil characteristics?
A. Clay particles hold tight to NO3- and the nitrogen content of clay soils is therefore high.
B. Clay is unable to retain Ca2+ and K+ which are easily leached away.
C. Sand prevents water erosion and leaching.
D. Clay holds water and clumps.
Answer: D
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a. repair of a defect (mutation) in a gene b. insertion of normal genes to act in place of mutant genes c. insertion of human genes into other organisms d. cloning of genes to produce and purify therapeutically useful proteins e. mapping of all human genetic information
Where do correlation, association, and learning occur in the brain?
A. cerebellum B. corpus callosum C. medulla D. cerebrum E. pons
Stratospheric ozone shields the planet from biologically harmful ultraviolet radiation
Indicate whether the statement is true or false
Inbreeding by itself can change gene frequencies
Indicate whether the statement is true or false