The black lace cactus (was/is) tiny, only 6 inches tall, and (grows/is grown) alone or in small groups in desert areas in Texas, the US.

Air pollution and acid rain (are also damaging / are also damaged) their habitat.

That's why the black lace cactus (also digs and takes / is also dug and taken) home for private collections.

The plant (has become / became) endangered because people (are destroying / are destroyed) its habitat.

The Apollo Butterfly (rarely sees / is rarely seen)

In areas where farmers (have cleared / are cleared) the land to plant grass for cattle, the cacti (are disappeared / have disappeared).

The species (is protected / is protecting) in many other countries, too: Sweden, Finland, Poland, the Czech Republic and it (is/was) illegal to catch, kill or harm it.

The plant (is / was) popular with collectors around the world because its large pink and purple flowers are very pretty.

Collectors (love / are loving) the beautiful butterfly and (were/are) ready to buy it at $3,000.

In our country they (put / have put) the butterfly on the list of endangered species in 1993.