How many days after fertilization does the zygote become a ball of cells?
a. five days
b. four days
c. one to two days
d. six to eight days
e. it depends on the age of the mother
C
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Wings of birds and butterflies have similar functions, but different evolutionary origins. They are:
A. physiological structures. B. homologous structures. C. analogous structures. D. phylogenetic structures.
You are investigating the life history of a previously unknown species of spider, when you discover an unusual fact; it seems that these spiders carry their fertilized eggs on their abdomen until they mature, at which point their offspring hatch, and devour their parent. Which term best describes this species’ reproductive strategy?
a. many offspring b. few offspring c. semelparity d. iteroparity
The part of the antibody that binds an antigen:a
is known as the Fc fragment. b. is called an epitope. c. makes up the tail of the Y-shaped molecule. d. recognizes the antigenic determinant of that antigen. e. is known as the constant segment.
Explain the protective functions of the vertebrate circulatory system.
What will be an ideal response?