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_______________________ occurs when introduction of one species reduces another species that require the same resources. Hint: Introduction of harmless bacteria to remove disease-causing bacteria in chicken. 

Which of the following biomes has a structure made up primarily of the mineral deposits secreted by its dominant organisms?

__________________ is a relationship in which one species benefits & the other is unaffected. For example, egrets and domestic cattle have this relationship. 

Which factor is density-independent?

In which groups of plants is the double fertilization occurs?

Photorespiration decreases the rate of photosynthesis. 

Hydrophilic molecules and ions can’t diffuse passively via the cell membrane. They need to pass through membrane proteins. This process is called ____________.

A human egg cell is ________, whereas a human skin cell is ________.

Half-life is the amount of time required for one-half the amount of a radioactive element that is originally present to decay into the daughter product.

In a pedigree, males are represented by _______ while females are represented by ________.