Monogamy is more likely to occur in
A. a species with external fertilization.
B. a species where females control access to resources.
C. a species where females aggregate for social reasons.
D. a species with a high degree of female parental care.
E. a species that lives in a habitat with very scattered resources.
Ans: E. a species that lives in a habitat with very scattered resources.
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A(n) _____________________ depicts the evolutionary relationships between related species
Fill in the blank(s) with correct word
What is contained in vascular bundles in leaves?
a. only xylem b. only phloem c. both xylem and phloem d. either or none may be present
The velocity of blood flow is the lowest in capillaries because _____
A) the capillaries have internal valves that slow the flow of blood B) the diastolic blood pressure is too low to deliver blood to the capillaries at a high flow rate C) the systemic capillaries are supplied by the left ventricle, which has a lower cardiac output than the right ventricle D) the total cross-sectional area of the capillaries is greater than the total cross-sectional area of the arteries or any other part of the circulatory system
Altering or eliminating harmful genes or inserting normal genes into defective cells is known as:
A. Gene therapy B. Gene manipulation C. Stem cell research D. Cloning