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If you were studying the type of circulatory system which has a heart that pumps blood within vessels only, you would be studying

The domestication of crops through artificial selection has a negative impact on biodiversity.  Ecologists observed corn crops that were wiped out by a pathogen while wild strains of corn were able to resist the pathogens.  This is an example of having

Which digestive or accessory organ is responsible for absorbing nutrients?

Which biome has reptiles doing very well but amphibians could not survive here?

One of the functions for ground tissue is to regulate gas exchange.

Scientists believe that plants evolved from charophytes.

Biodiversity helps provide many services to humans.  Which one of the following is NOT a valuable service?

Growth in plants is made possible by tissues called meristem.

Which one is a modified root that steals water and nutrients from a host plant?

Which biome has permafrost and few weeks long summers?