Is vegemite made from vegetables?
Vegemite is a popular Australian food spread that is made from leftover brewer's yeast extract and various vegetable and spice additives. So while it does contain some vegetable ingredients, the primary ingredient in Vegemite is yeast extract, which is a byproduct of beer brewing. Therefore, while it contains vegetable additives, Vegemite is not strictly speaking made solely from vegetables.
Is it true that spreading vegemite behind the ears can deter drop bear attacks?
No, spreading Vegemite behind the ears is not an effective way to deter drop bear attacks. This is a common myth or joke in Australia, but it has no basis in reality. Drop bears are not a real species of bear, but rather a fictional creature often used to scare tourists. So there is no need to use Vegemite or any other substance as a deterrent against drop bear attacks.