The products of photosynthesis move from the leaf to other parts of the plant via
A. xylem.
B. cortex.
C. xylem and cortex.
D. phloem.
E. phloem and cortex.
D. phloem.
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Most of the carbon dioxide produced by the body is transported to the lungs as ____
a. a gaseous form b. blood plasma c. potassium carbonate ions d. bicarbonate ions e. carbonic acid
Populations can be divided into three ecologically important age classes: prereproductive, reproductive, and ________
Fill in the blank(s) with correct word
The natural role of restriction enzymes in bacteria is to
A. make conjugation more efficient. B. allow transposons to move to another place in the chromosome. C. protect the cell from invading phages. D. allow cells to accept foreign DNA. E. provide the cell with new phenotypes, such as antibiotic resistance.
An infectious disease is an infection that impairs the normal state of health
Indicate whether this statement is true or false.