What will occur if a morula divides into three masses of cells?
A) The resulting embryos will develop severe birth defects due to missing genes.
B) The resulting embryos will die.
C) Normal identical triplets will be born.
D) Three distinctly different embryos will develop, depending on which homeoboxes went with which mass of cells.
E) The resulting embryos will develop, but they may be missing some organs based on which germ layers were transferred with each section.
C
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All multicellular organisms have a nervous system
A. true B. false
Active transport in plant root cells requires that those cells have access to O2. Normally there is enough O2 available
in air pockets in the soil, but flooded soil has very little O2. Thus, unless they have special adaptations, plants in flooded soil effectively have no active transport in their roots. Which of the following should you expect to occur for trees without special adaptations to flooding after several days in flooded soil?
a. excess uptake of water and minerals in the xylem only b. wilting of their leaves c. bursting of leaf cells due to excess water flow d. excess water pushed out at the margins of their leaves only e. excess uptake of water and minerals in the xylem, and excess water pushed out at the margins of their leaves
In a natural community, the primary consumers
are
a. herbivores. b. carnivores. c. detritivores. d. decomposers. e. producers
The study of the relationships among organisms and the environment is
A. ethology. B. habitology. C. ergonomics. D. ecology. E. geology.