Darwin's studies of Galapagos finches are well known in the study of evolution. These studies have been instrumental in helping us understand how new species evolved from pre-existing species. Which statement is true about the speciation of the Galapagos finches?
A) The finches evolved traits to help them survive in different environments.
B) The finches had different traits that influenced the environment in which they chose to live.
C) Genetic variation occurred amongst the finches, giving some a genetic advantage in a changing environment, allowing them to better survive.
D) Members of the original population evolved in such a way that it became impossible for individuals from the two new populations to interbreed.

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation:

b. the carbon cycle ensures living things have a source of hydrogen

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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