Gas exchange in humans is the delivery of oxygen lungs to the bloodstream, and the elimination of carbon dioxide from the bloodstream to the lungs.
Answer:
Explanation:
all the fresh water on the earth are present only in 3 percentage,in the form of glaciers and ice capes.so if this ice melts then they get mixed with the salty water.which will result in the of depletion of the fresh water present on the earth.
Answer:
D. The proportion of mottled fish will increase over time.
Explanation:
In a lake with mottled appearance mottled fish will have advantage over the light brown fishes because light fishes would be easy to be seen by predators.
The proportion of mottled fish will increase over time because of the natural selection. Natural selection is evolutionary mechanism which changes the frequency of a certain allele (consequently, gene and phenotype) by favouring traits (structures, behavior) of an organism that help him survive and reproduce. In the example, above, mottled fish have mottled phenotype that help them survive and reproduce so it will be favorable trait by natural selection.
For the answer to the question above, they get energy by breaking down dead organisms. A decomposer gets its energy from the dead animals they eat. Decomposers get energy in much the same way as Heterotrophs <span>obtain energy. They take organic matter called detritus.</span>
D. Genes. They have genetic material that determine our characteristics.