Not resistant

A sibling's younger sibling (used especially by children or by parents in speaking to their children).

(linear algebra) Multiplication of a vector by a scalar (which belongs to the vector space's field of scalars). / (abstract algebra) multiplication of a module element by a ring element

(biology, geography, uncountable) The study of the geographical distribution of living things. / (biology, geography, countable) The geographical distribution of a particular living thing.