Parkinson's disease is a progressive degenerative disease that leads to loss of neurons in particular locations of the brain. Given this information, what type of tissue does Parkinson's affect?
O Nervous
O Muscle
O Connective
O Epithelial

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.

Idon’t understand this can someone give me the answer? you

Read the prompt and study the diagram above. what cause and effect prediction can be used to test the assumptions in the model? a) limiting water will limit sugar production of the plant b) limiting sunlight will limit sugar production of the plant c) limiting carbon dioxide will limit sugar production of the plant d) limiting sunlight, water, or carbon dioxide will limit sugar production of the plant