Which of the following best describes the process of meiosis?

a. it is the first stage of mitosis
b. it occurs in all tissues that require growth or replacement
c. it happens in all cells except in the brain and nervous system
d. it is carried out in cells that are involved in sexual reproduction

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they each offer a fresh glut of resources to the organisms that can arrive and exploit them. as individuals and new species continue to appear, they actively and passively alter the environment. competition for shared resources increases, local abiotic and biotic conditions shift, and the relative abundances of species change accordingly. the process is called ecological succession, and it is one of the earliest and most well-known concepts in ecology.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.