Many kinds of cactus and other desert plants, such as a Euphorbia, are remarkably similar in that they have fleshy plant bodies and spines. Their flower structures, however, show that they are not related. The process considered to be responsible for their similarity in structure is 

A. convergent evolution.
B. divergent evolution.
C. adaptive radiation.
D. speciation by polyploidy.


A. convergent evolution.

Biology & Microbiology

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The system of communication between cells through signaling pathways is called homeostasis

a. True b. False

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The binding site for an antigen is located in which region of an antibody?

1.Between the variable region of the light chain and the variable region of the heavy chain. 2.Between the variable region and the constant region of the light chain. 3.Between the variable region and the constant region of the heavy chain. 4.Between the constant region of the light chain and the constant region of the heavy chain.

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Red-green color blindness is an X-linked recessive trait. Two normal-vision parents have a color-blind

son. Indicate the genotype and phenotype of each parent and the son. What will be an ideal response?

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The enzyme that catalyzes the addition of a phosphate to adenosine diphosphate is

What will be an ideal response?

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