Which part of the nervous system is the first to work when joshue feels a raindrop fall on his arm?

Sensory neuron

Explanation:

Through the sensory neurons the individual captures stimuli and information from the surrounding environment and from his own body. The stimuli are transmitted as electrical impulses to the central nervous system. In turn, the central nervous system processes information, translating it into sensations and generating responses. This is how we see what is around us, feel when someone pinches us, perceive raindrops falling on our arm, taste the food, among many other sensations.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.