Which of the following statements regarding saltwater fish is true?
A) The concentration of solutes in the internal fluids of saltwater fish is lower than that in the surrounding water.
B) The concentration of solutes in the internal fluids of saltwater fish is higher than that in the surrounding environment.
C) Saltwater fish produce large amounts of diluted urine.
D) Saltwater fish have body fluids with a solute concentration equal to their surroundings.
Answer: A
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Earthworms show all of the following features except
A. containing segments with a mouth on the first and the anus on the last. B. containing touch-sensitive and light-sensitive organs in the segments. C. containing fewer setae than in polychaetes. D. containing distinct head regions and parapodia. E. being hermaphroditic.
Pigments, specifically, function for
photosynthesis by which of the following?
a. electron excitation and energy emission b. reflection of light energy c. splitting water into hydrogen and oxygen d. capturing light e. none of these
At which point during pregnancy can human chorionic gonadotropin be detected in the mother’s blood?
1.at the time of fertilization 2.at the time of implantation 3.by the first week of pregnancy 4.by the third week of pregnancy 5.by the sixth week of pregnancy
Coelomates are
A. animals that have a true coelom. B. two embryos that develop in the same coelom. C. animals that have two coeloms. D. animals in which the coelom disappears at gastrulation. E. animals that have no coelom.