Hundreds of years ago, it was believed by many that our solar system was geocentric. this means that earth is at the center of the solar system, with the sun and other planets orbit around it. today, the solar system is now thought to be heliocentric.

what does this mean?

question 6 options:

the sun and other planets orbit earth.

earth and all the other planets orbit the sun.

the other planets orbit earth, and earth orbits the sun.

the sun orbits earth and the other planets orbit the sun.

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.