Biology questions, help?

[dyb]

1.) Darwin observed that different, but closely related, species of finches filled the diverse environmental niches on different Galapgos Islands. The filling of these environmental niches is known as ________.
2.) Consumers generate _______ and utilize ________.
3.) For life to exist, the chemical elements of the Earth must be _____ among organisms and the enviro.
4.) What are pioneer organisms?
5.) An overpopulation of an animal in a certain area will most likely lead to _______ between these animals.
6.) Define geographic isolation.
7.) ___________ is a disorder in which is characterized by fragile red blood cells and severe pain from blocked blood vessels.
8.) What are diploid cells?
9.) Define the role of nitrogen-fixing bacteria

 

[emucompboy]

1.) Darwin observed that different, but closely related, species of finches filled the diverse environmental niches on different Galapgos Islands. The filling of these environmental niches is known as ________.

adaptive radiation

2.) Consumers generate _______ and utilize ________.
carbon dioxide; oxygen

3.) For life to exist, the chemical elements of the Earth must be _____ among organisms and the enviro.
recycled

4.) What are pioneer organisms?
Pioneer organisms are the first ones to colonize "newly formed" terrestrial habitat. New terrestrial habitat can be from volcanic activity (primary succession) or from things like devastating fires (secondary succession).

5.) An overpopulation of an animal in a certain area will most likely lead to _______ between these animals.
competition

6.) Define geographic isolation.
Two populations of organisms cannot breed with each other because they cannot cross a big landscape feature that is between them. Example: Ground squirrels on one side of the Grand Canyon can't cross the Grand Canyon to mate with the ground squirrels on the other side of the Grand Canyon.

7.) ___________ is a disorder in which is characterized by fragile red blood cells and severe pain from blocked blood vessels.

I have no idea what your teacher wants, since there's more than one disease that causes these things.

8.) What are diploid cells?
Diploid cells have a full complement of chromosomes, the 2n number of chromosomes, with pairs of homologous chromosomes.

9.) Define the role of nitrogen-fixing bacteria
They fix nitrogen, producing amines and nitrates from atmospheric nitrogen. The fixed nitrogen is absorbed by plants and used to make important things like amino acids and nucleic acids.