What is a contributing factor to an estuary's high productivity?
a. The large amount of primary producers
b. The small amount of predators.
c. The biomass of detritivores.
d. The trapping of nutrients in sediments.
d
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In most human populations, lactase levels are highest soon after birth and drop off in middle-to-late childhood
a. True b. False Indicate whether the statement is true or false
In human females, one of the sex chromosomes is switched off during early development in a
phenomenon called a. karyotyping. b. X inactivation. c. X linkage. d. crossing over. e. SRY activation.
The main hypothesis about the origin of the first living organisms is called ________
A) chemo-evolution B) novel design C) biogenesis D) cytosynthesis
What description applies to a disease-causing organism that can spread from one organism to another?
A) contagious B) infectious C) parasitic D) microscopic