Water flowing over gills and blood flowing through gill capillaries moving in opposite directions is called .
a. capillary respiration
b. out pouching exchange
c. anaerobic respiration
d. countercurrent exchange
e. lactate respiration

3points hurry! what is the relationship between biotechnology, sharkskin, and disease resistance? bioengineers have developed an artificial sharkskin that does not allow resistant bacteria to grow on it. disease-causing microbes have been genetically modified to keep them from infecting the skins of sharks. scientists have created a device that can be attached to the skins of sharks that dramatically increases their abilities to resist disease. sharkskin produces many chemicals that can be collected and used to create antibiotics.

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite

Which member of the following food chain will be least affected by ddt, a pesticide water pollutant, if bio-magnification is occurring? algae> zooplankton> crayfish> leopard frog> large mouth bass