Which of the following explains how phloem sap moves within a plant?
A) cohesion-tension mechanism
B) gravity pulls the phloem sap down
C) pressure-flow mechanism
D) transpiration
C
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Individuals with severe combined immunodeficiency syndrome (SCID) have a genetic defect that prevents proper formation and expression of immunoglobins and T cells and therefore do not have adaptive immunity
Indicate whether the statement is true or false.
The principal advantage of sexual reproduction is that it "reshuffles the genetic deck." The creation of new combinations of alleles during sexual reproduction–complete with outbreeding and meiosis with crossing over–is called ________
[two words] Fill in the blank(s) with correct word
In order for a person's DNA to be used for his or her identification, which of the following tools/techniques must also be used in the process?
a) PCR b) gel electropheresis c) restriction enzymes d) All of the above techniques/tools must be used. e) Only a) and c) must be used.
Based on the fossil record, compared to the number of species alive today, the number that are extinct is ________, but there may be ________ now than at any time before
Fill in the blank(s) with the appropriate word(s).