"some cases of sudden infant death syndrome (sids) may include biological vulnerabilities in the function of which neurotransmitter? "

How can you keep track of variables in a science experiment?

All vaccination should(n’t) be mandatory! 1.at least 5 sentences explaining 2.why? 3.in the end summarize the sentence

The fruit of a certain plant is sweet and fleshy. the seeds of this plant have a seed coat that is fairly tough. the seeds germinate better if they are exposed to acid, or scarification. what is the most likely type of dispersal for this seed? water animal wind