Which organism has a challenge to maintain cellular electrolyte and fluid balance in its environment?
A. A bacterium in Great Salt Lake
B. A bacterium in a fresh-water lake
C. A protozoan in a fresh water lake
D. All of the above have problems in maintaining electrolyte and fluid balance within the cell.
Answer: D
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What is the relationship between age-specific mortality and age-specific survivorship?
a. age-specific mortality is the proportion of individuals alive at the start of an age interval; age-specific survivorship is the proportion that die before the start of the next interval b. age-specific survivorship is the proportion of individuals alive at the start of an age interval that die during the age interval; age-specific mortality is the proportion that survive until the start of the next interval c. the sum of age-specific mortality and age-specific survivorship always equals 1 d. the sum of age-specific mortality and age-specific survivorship always equals 1 e. age-specific survivorship is always greater than 1
Which statement most accurately describes the deuterostomes?
a. The first opening on the embryo surface becomes the mouth. b. Their food and wastes enter/exit through the same body opening. c. They have an incomplete digestive system. d. They all have radial symmetry. e. Their mouth develops from the second embryonic opening and the first opening becomes the anus.
_____ benefit(s) living organisms by absorbing most ultraviolet (UV) radiation from incoming sunlight
a. The ozone layer b. Nitrogen c. Carbon dioxide d. Chlorofluorocarbons e. Sulfur oxides
Which of the following was not an adaptation for animals to live on land?
a. internal fertilization b. egg shell c. embryo development within the female d. external respiratory surfaces e. skeletal system and muscles