what is allery? write two points.
aarav4991:
hii
your immune systems job is to protect u from harmful bacteria and viruses.if u have allergic reactions then part of ur immune system will work too hard .it may attack harmless substances.
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ᴀɴ ᴀʟʟᴇʀɢʏ ᴏᴄᴄᴜʀs ᴡʜᴇɴ ʏᴏᴜʀ ʙᴏᴅʏ's ɪᴍᴍᴜɴᴇ sʏsᴛᴇᴍ sᴇᴇs ᴀ ᴄᴇʀᴛᴀɪɴ sᴜʙsᴛᴀɴᴄᴇ ᴀs ʜᴀʀᴍғᴜʟ. ɪᴛ ʀᴇᴀᴄᴛs ʙʏ ᴄᴀᴜsɪɴɢ ᴀɴ ᴀʟʟᴇʀɢɪᴄ ʀᴇᴀᴄᴛɪᴏɴ. sᴜʙsᴛᴀɴᴄᴇs ᴛʜᴀᴛ ᴄᴀᴜsᴇ ᴀʟʟᴇʀɢɪᴄ ʀᴇᴀᴄᴛɪᴏɴs ᴀʀᴇ ᴀʟʟᴇʀɢᴇɴs. ᴛʜᴇʀᴇ ᴀʀᴇ ᴍᴀɴʏ ᴛʏᴘᴇs ᴏғ ᴀʟʟᴇʀɢɪᴇs. sᴏᴍᴇ ᴀʟʟᴇʀɢɪᴇs ᴀʀᴇ sᴇᴀsᴏɴᴀʟ ᴀɴᴅ ᴏᴛʜᴇʀs ᴀʀᴇ ʏᴇᴀʀ-ʀᴏᴜɴᴅ.
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