Most theoretical models concerning mechanisms of reproduction conclude reproduction provides an advantage for adapting to temporal and spatial variation in the environment. A. sexual; physical sexual;
B. biotic and physical asexual;
C. biotic and physical asexual;

How do the sperm cells get from the stigma to the ovules? a. they slide down the petals to the bottom of the flower. b. they travel through pollen tubes. c. they travel along filaments. d. insects carry the sperm cells from the stigma to the ovules.

What will happen if two of the base pairs of the stand of the dna are switched

Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.