What is the correct sequence for the start of an organism's life cycle?
A) fertilization ? meiosis ? zygote ? embryo
B) meiosis ? fertilization ? zygote ? embryo
C) fertilization ? zygote ? meiosis ? embryo
D) meiosis ? fertilization ? embryo ? zygote
B
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Before plowing a field, a farmer thought the bare field looked weed-free. Three days after plowing and turning over the soil, he was amazed to see thousands of tiny seedlings. What is the most likely reason for the mass germination of seeds?
A) large seeds that needed soil disturbance to germinate B) small seeds that need light to germinate C) small seeds that were scarified by exposure to plow D) large seeds that needed exposure to higher levels of oxygen to germinate
All known species of bacteria are described in Bergey's Manual of Systematic Bacteriology
Indicate whether this statement is true or false.
California's native golden trout declined after European brown trout and eastern brook trout were introduced into California's mountain streams for sport fishing. This is an example of what type of threat?
a. overharvesting b. commercial sporting c. invasive species d. endemic species e. habitat destruction
The growth hormone is
a. prolactin.
b. adrenalin.
c. thyroxine.
d. ACTH.
e. somatotropin.