(Q).
You are presented with the question "cutting down trees has a negative impact on the health of what?" and the following answer choices: - space - humankind - mars - aliens - salmon - Species - humans - plants Now knowing that cutting down trees has a negative impact on an ecosystem and when ecosystems are healthy, humankind is healthy, choose the best answer.
(A).
humankind

(Q).
You are presented with the question "What do frogs breathe with when they are adults?" and the following answer choices: - skin - fins - lungs - oxygen - gills - air - Energy - Gases Now knowing that most amphibians breathe with gills as larvae and with lungs as adults and all frogs are amphibians, choose the best answer.
(A).
lungs

(Q).
You are presented with the question "What makes food for themselves and other organisms?" and the following answer choices: - agriculture - honeybees - water - sunlight - most plants - viruses - Conifers - Chlorophyll Now knowing that producers are organisms that produce food for themselves and other organisms and most plants are producers, choose the best answer.
(A).
most plants