Select all of the following that are true about cephalopods.
_____ They may be very large and can weigh over 1000 pounds.
_____ They are very intelligent and are capable of learning by observation.
_____ They lack a shell.
_____ They are exclusively herbivorous.
_____ They have a closed circulatory system
__X__ They may be very large and can weigh over 1000 pounds.
__X__ They are very intelligent and are capable of learning by observation.
_____ They lack a shell.
_____ They are exclusively herbivorous.
__X__ They have a closed circulatory system
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Cytotoxic T cells destroy target cells by
A. the CD95 pathway. B. the perforin pathway. C. direct killing mediated by activated oxygen species. D. both direct killing mediated by activated oxygen species and the perforin pathway. E. both the perforin pathway and the CD95 pathway.
According to the theory of evolution, those best adapted to the environment will _____
a. survive and reproduce b. not survive c. produce offspring that are genetically identical to the parents d. have lower fertility rates e. have fewer offspring on average
An interaction between two species in which one
species benefits and the other species is harmed is a. mutualism. b. commensalism. c. competition. d. predation. e. none of these.
A challenge to traditional (pre-1860) ideas about species came from embryology, where it was discovered that _________.
A. all animals develop similar embryonic gills B. embryos of dissimilar organisms, such as sharks and humans, resemble each other C. the more advanced the animal, the more slowly it develops D. mutations have a far more dramatic effect on embryos than on adult organisms