Elephants are valued by some people because their tusks are made of ivory. Although it is illegal, people kill
elephants, take the ivory, and sell it to make a variety of objects like jewelry and sculptures. This activity is an
example of which threat to biodiversity?
poaching
habitat destruction
pollution
nonnative species

Poaching.

Explanation:

The descriptions for each of the terms you listed:

poaching: illegal hunting of wild animals habitat destruction: the process in which a habitat becomes unsuitable for supporting life, often by human activitypollution: the introduction of hazardous or harmful waste into the environmentnonnative species: a species introduced to a new habitat, often by human activity, that thrives unusually well due to having no natural predators in its new habitat.

Hunting elephants (an illegal activity in many countries) for their ivory is considered poaching.

Answer; This activity is poaching and is a major threat to biodiversity

Explanation; poaching is the act of taking the ivory off of an elephants tusks. From the text , you can inferred that the act is poaching because it says " people kill elephants, take the ivory and sell it"

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom