Which of the following are important functions of roots? Roots are where cotyledons emerge.
Roots enable plants to spread over land areas.
Roots hold the plant in place in the ground.
Roots store minerals and carbohydrates for the plant.

the answer is a or when it says crossing over

this protocol describes a detailed procedure for intracellular flow cytometry staining.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".