Which of the following best describes the major problem(s) amphibians face?
A) Developmental abnormalities from UV light exposure and ozone depletion
B) A major decrease in populations due to a variety of factors, including toxins, UV exposure, fungal infections, and habitat destruction
C) Habitat destruction, global warming, and X-ray exposure
D) Exposure to environmental toxins, global warming, and ozone depletion
E) Fungal infection, bacterial infection, and prion infection
B
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An ecosystem is made up of ____
a. only plants, animals and fungi b. organisms and nonliving things c. only rocks and minerals d. only plants, protozoa, and fungi e. the biosphere of the region
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.
Spherical bacteria are called ________
A) archaebacteria B) eukaryotes C) cocci D) bacilli E) None of these choices
Select the best response to the question. ?The nucleus of a cell is responsible for which of the following functions?
A) maintaining the shape of the cell B) protecting the integrity of the cell C) controlling the cell's activities D) production and storage of energy