חוששששששששששששששששששששששש
Complete the sentences to describe the different levels of organization in organisms.
A(n)
v is a group of organs that work together to perform a common function.
A(n)
- is a group of tissues that work together to perform a common function.
A(n)
is a basic unit of structure and function of all living things.
A(n)
v is a group of cells that work together to perform a common function.

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.