Finally, there is safety in numbers at communal roosts since there will always be a few birds awake at any given moment to give the alarm.",,,,==Communal roosts are safe because birds take turns sleeping and guarding against danger.|Birds at communal roosts tend to sleep deeply, relying on others to wake them up in case of danger.|There are fewer threats at communal roosts because all the birds stay awake to watch for predators.|Birds in communal roosts do not sleep, which makes them more aware of potential dangers.">

shattered" in line 20 is CLOSEST in meaning to,,,,arranged|dissolved|==broken apart|gathered together">

Most stones have capillary passages that suck salt water from the wet ground.",,,,==Most stones contain tiny channels that absorb salt water from the damp soil.|Stones have large pores that let water pass through them easily.|Most stones store water in their capillary spaces to maintain moisture.|Most stones absorb salt from the air when exposed to humidity.">

Care robots or HSRs (Human Support Robots) help elderly and disabled patients to get in and out of bed or a wheelchair. Some remind patients when to take their medicine, and a few even provide support and act as a companion for lonely people."?,,,,==Care robots help patients with mobility problems and provide emotional support.|Care robots are mainly designed for personal hygiene tasks.|Human Support Robots are only used to remind patients to take their medicine.|Care robots are used for household chores and do not interact with patients.">

it" in line 9 refers to,,,,==salty water|groundwater table|capillary action|sediment">

exert" in line 14 is OPPOSITE in meaning to,,,,==Idle|Struggle|Push|Engage">