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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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.
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.