Question

The total number of cataloged species on Earth in both marine and terrestrial environments is currently 1.8 ________.

a. radio_button_unchecked thousand.
b. radio_button_unchecked trillion.
c. radio_button_unchecked billion.
d. radio_button_unchecked quadrillion.
e. radio_button_unchecked million.

Answer 1

Answer is E.

Step-by-step explanation:

Cataloged species means listed species. This probably means the list of known or recognised species both in marine and terrestrial habitats.