Which mechanism do sponges possess that makes a predator think twice before attacking it? A. They have flagellated cells. B. They produce toxins that make them poisonous. C. They forcibly draw water inside the body.

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

18. how do the cells in meiosis differ from the cells in mitosis?

Describe the trends in electron configuration in the periodic table by selecting the terms from the drop down menus