Limits to variation The most obvious limit to natural selection is that suitable variation may not be available. This may be because certain phenotypes cannot be built, being ruled out either by physical law or by the properties of biological materials.
Answer:
Plants have cell walls provide support and gives the plant its shape. Plant cells have chloroplasts, but animal cells do not. Chloroplasts enable plants to perform photosynthesis to make food(glucose). Plant cells usually have one or more large vacuole, while animal cells have smaller vacuoles, if any are present.
Answer:
La biogeografía es el estudio de la distribución de especies y ecosistemas en el espacio geográfico y a través del tiempo geológico.
Where heavy metals pesticdes move up the food chain and start to kill lower leveled species/ animals.
Answer:
The correct answer is a cofactor for enzyme activity.
Explanation:
Carboxypeptidase is a metallo-enzyme in which zinc is present at active site. It has been accounted for by Coleman and Vallee that the protein can be deactivated by the removal of zinc and that reactive again by the expansion of zinc, cobaltous, ferrous, nickel. which suggests that zinc is acting as the cofactor for this metalloenzyme. Zinc is a cofactor for up to 300 chemicals in the body. Proteins that utilization zinc as a cofactor is known as metalloenzymes.
Thus, the correct answer is a cofactor for enzyme activity.
