What is the stinging organelle of paramecium that assists it in capturing large prey?

The earth's oceans are made up of chlorine, and trace elements. a) carbon, oxygen b) oxygen, silicon c) hydrogen, oxygen d) nitrogen, oxygen

Astudent sees several ants walking up a wall following the exact same trail that an ant took earlier. she wants to apply the scientific method to determine how the ants detected the trail. which of these steps would come first in her application of the scientific method? perform an experiment by cleaning the scent away from part of the trail. draw a conclusion that the ants follow a scent trail. make a prediction about what the ants will do after she cleans away part of the trail. hypothesize that the ants are following a scent trail that the first ant left.

Joseph lives in a country that lacks basic social infrastructure. moreover, the banking system is not managed properly. the level of education is low. in which type of country is joseph residing? generally, what is the trend of fertility rate in such countries?