I do not understand this one question

Some strains of bacterium streptococcus pyogenes secrete poisonous substances called exotoxins. the genes encoding the exotoxins are thought to have originated in bacteriophages, which are viruses that infect bacteria

a population of domesticated sheep becomes stranded on a rocky island. over many years, the physical traits of the sheep population are altered.

True or false for both Chromosomes, which carry genes, are found in the nucleus of the cell Both animal and plant cells have a cell wall

The periodic table lists the elements according to

What effect does food color have on what food fish eat

Which structure of the respitory system allows for gas exchange

What does not depend on the population size of organisms living in an area

What occurs during the g1 phase (gap phase 1) of interphase.?

How does human evolution relate to the sensibility of disease

Explain how negative feedback affects the bodies hormones.