Amyotrophic lateral sclerosis (ALS) usually causes death by ____
a. paralysis
b. heart failure
c. respiratory failure
d. brain death
e. liver failure
ANSWER: c
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The early Earth reducing atmosphere is thought to have lacked which of the following gases?
A. N2. B. O2. C. CO2. D. H2O. E. SO4.
Island species are especially vulnerable to extinction because may destroy a small island population.
A. the introduction of a new predator B. a single event like a hurricane C. random fluctuations in birth and death rates D. All of the answer choices are correct. E. the extinction of a prey species
According to the first law of thermodynamics, ____
a. the energy of a system always increases b. the amount of energy in the universe is changeable c. chemical reactions do not create or destroy energy d. energy is always stable e. energy always decreases
What are specialized cells (egg cells and sperm cells, for example) used for sexual reproduction?
What will be an ideal response?