If intervertebrates are a major food source for other organisms, including humans, then what is a major food source for humans? Answer choices: - poison dart frogs - honeybees - barnacles - intervertebrates - other humans - photosynthesis - the body's largest organ - Most plants
intervertebrates

If animals in the frog family are the first true tetrapods, then the first tetrapods were? Answer choices: - major threat to health - remains of prehistoric life - in the frog family - running and lifting - competing for resources - warm-blooded - objects that have mass - graptolites
in the frog family

If damming a river opens new areas for water skiing, then to open more areas for water skiing, engineers could? Answer choices: - dam more rivers - to move people - protect them - vacation in Norway - Move to another area - build more snow machines - scrap all steam locomotives - Electric generators
dam more rivers

If tiny ocean organisms feed on phytoplankton, then what ocean organisms feed on phytoplankton? Answer choices: - gills - fungi - a fish - life - CO 2 - edible - sharks - tiny
tiny