Original population Equal
frequency
of black
and white
alleles
Allele frequency
differs
New population increase
New population increase
Chance event reduces
population size
Chance event reduces
population size
1. The model shows a demonstration a student prepared
using black and white marbles to show how populations of
organisms can change. Which of the following concepts is
best illustrated by this demonstration?
A Evolution of a predatory species
B Genetic drift accompanying natural selection
C Environmentally induced genetic mutations
D Immunity from virulent microorganisms
A
B
C
D

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.

answer; behavioral neuroscience;