The veins of leaves are used for
a. support.
b. identification.
c. transport of water and nutrients.
d. detachment in the autumn.
e. all of these.
Answer: c
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Which statement is true?
a. The production of gametes via meiosis is much simpler than mitosis because the resulting gametes only contain half as much genetic material. b. Chromatid crossover rarely results in viable zygotes because gametes lack a mechanism for lining up homologous gene sequences when this happens. c. The potential genetic variation between two zygotes is greater than the potential genetic variation between skin cells from the same organism. d. Because they are not homologous chromosomes, X and Y chromosomes do not form synaptonemal complexes during meiosis.
In the 1950s, mitochondrial genomes were discovered by differential staining for ________
Fill in the blank(s) with correct word
What disadvantage does sound communication have?
What will be an ideal response?
Which of the following statements about the humoral immune response is true?
A) The humoral immune response defends against bacteria and viruses by activating T cells. B) The humoral immune response defends primarily against bacteria and viruses present in body fluids. C) The humoral immune response plays a major role in protecting the body from cancerous cells. D) The humoral immune response is the result of macrophages producing antibodies.