A couple has four children. What is the probability that they have four boys?
A) 1/2
B) 1/4
C) 1/8
D) 1/16
E) 1/32
D
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You must prevent ______ and practice ________ techniques
Fill in the blank(s) with the appropriate word(s).
Which statement about locomotion is true?
A) Locomotion requires energy to overcome friction and gravity. B) Gravity is a greater locomotion problem for animals in water than for those on land. C) Overcoming friction is a greater locomotion problem for land animals than for those that live in water. D) Bone strength is more important than body shape in the locomotion of land animals.
Explain why mutualism is sometimes viewed as ‘reciprocal exploitation’. What will be an ideal response?
Which of the following statements about embryonic development is NOT true?
A. A zygote undergoes cleavage, which increases the cell number, but not the volume of the egg cytoplasm. B. A primitive gut is also referred to as an archenteron. C. A blastopore is the opening into the primitive gut formed by gastrulation. D. A blastocoel is the fluid-filled cavity of a blastula. E. The primitive streak occurs in the morula stage of the embryonic development.