Which data were used in the population viability analysis conducted for the yellow-bellied glider?
a. age distributions and survival probabilities
b. litter sizes and sex ratios
c. home ranges and litter sizes
d. sex ratios, age distributions, and litter sizes
e. litter sizes, sex ratios, lifespan, home range sizes, survival probabilities, and age distributions
ANSWER: e
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A biologist uses a time machine to collect living material from 2 different time periods. Sample A is 3 billion years old and sample B is 1.5 billion years old. How would these samples differ?
A. Prokaryotic organisms would be abundant in sample A but absent from sample B. B. Eukaryotic organisms would be present in both samples but much more common in sample B. C. Prokaryotic organisms would only occur in sample B. D. Eukaryotic organisms would be absent from sample A.
Why is a variegated plant considered heteroplasmic?
A) The plant has mutant and wild-type chloroplast DNAs distributed amongst the cells in different ratios. B) The plant has only two types of cells, one with only mutant chloroplast DNAs and one with only wild-type chloroplast DNAs. C) All of the plant's cells have mutant and wild-type chloroplast DNAs. D) All of the plant's cells have mitochondria and chloroplasts.
Long-term potentiation involves a long-lasting decrease in the strength of synaptic connections
____________________ Indicate whether the statement is true or false.
Mechanical digestion begins in the _____________.
a. Stomach b. Oral cavity c. Esophagus d. Intestines