In a pond ecosystem, a crayfish feeds on three species of algae. It is in turn preyed upon by one species of fish and a heron. The heron also preys upon the fish. What is the minimum number of food chains in this food web?
A. 2
B. 3
C. 4
D. 5
E. 6
Answer: E
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Which of the following correctly describes a difference between spermatogenesis and oogenesis?
A) Spermatogenesis results in four mature sperm cells, while oogenesis results in one mature egg cell. B) Spermatogenesis results in one mature sperm cell, while oogenesis results in four mature egg cells. C) In spermatogenesis, mitosis occurs twice and meiosis once, while in oogenesis, mitosis occurs once and meiosis twice. D) Spermatogenesis results in four mature sperm cells, while oogenesis results in one mature egg cell. In spermatogenesis, mitosis occurs twice and meiosis once, while in oogenesis, mitosis occurs once and meiosis twice.
You are the lucky student of a wacky professor who develops a time machine. He asks if you will test it with him. You get in and there is an immediate glitch–the date readout fails so that when you land you are not sure what era you are in
Your professor begins to panic, but you see something that tells you are in the Cenozoic era. Which of the following could it be? A) a rabbit eating a daisy B) a water lily floating in a pond C) masses of green ferns with dragonflies hovering above them D) a bee pollinating a flower
Why is Line B a better fit for the data in this graph?
A. For Line B, the average residual (difference between the actual Profits and point on the line) is zero. B. Line B's slope is less steep than the slope of Line A. C. For Line B, the residuals (difference between the actual Profits and point on the line) are uncorrelated with Price. D. Line B's intercept is smaller than Line A's intercept.
The majority of a eukaryotic cell's life is spent in an "in-between-division" stage referred to as:
A) prophase. B) interphase. C) DNA synthesis phase. D) dormant phase. E) mitotic phase.