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Biogeographic isolation is the separation of organisms of a species through geographical or biological forces.
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D because the others have nothing else deals with an empty garden that has an effect on things
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Summary. Multiple types of evidence support the theory of evolution: Homologous structures provide evidence for common ancestry, while analogous structures show that similar selective pressures can produce similar adaptations (beneficial features).
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Brainliest is appreciated, have a nice day :)
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1-f; 2-e; 3-a; 4-b; 5-c; 6-d.
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Integumentary System - Regulates body temperature, houses cutaneous receptors and synthesizes vitamin D
Nervous System - Responsible for consciousness and memory
Endocrine System - Secretes hormones
Lymphatic System - Transports and filters lymph fluid
Urinary System - Filters and removes waste products from blood
Respiratory System - Responsible for gas exchange between blood and air
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Our atmosphere (air) is comprised of 78% of nitrogen. However, this nitrogen is in its elementary state (N₂) and therefore is quite inactive, so the plants can not use it directly. Changing the elementary nitrogen into more reactive forms (NH₃, NO₂, HNO₃) is occurring through the process called nitrogen fixation. It is happening via two processes.
First one is physical nitrogen fixation. When some type of atmospheric physical energy (lightning bolt, for example) reacts with N₂, it splits it in two very reactive N atoms, enabling them to react with oxygen in order to form NO₂.
Second process is biological nitrogen fixation. It's done by bacteria, special bacteria living in the soil, able to use elementary nitrogen for its metabolical pathways resulting in production of ammonia, which can be used by plants. It's noteworthy that bacteria are responsible for about 90% of all nitrogen fixation.
