You are presented with the question "What is a major food source for humans?" and the following answer choices: - poison dart frogs - honeybees - barnacles - intervertebrates - other humans - photosynthesis - the body's largest organ - Most plants Now knowing that mollusks are a major food source for other organisms, including humans and mollusks are invertebrates and are no exception, choose the best answer.
intervertebrates

You are presented with the question "The first tetrapods were" and the following 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 Now knowing that amphibians are the first true tetrapods, or vertebrates with four limbs and all frogs are amphibians, choose the best answer.
in the frog family

You are presented with the question "To open more areas for water skiing, engineers could" and the following 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 Now knowing that damming a river can cause a lake to form and you can also water ski on Lake Mohave north of Davis Dam, choose the best answer.
dam more rivers

You are presented with the question "What ocean organisms feed on phytoplankton?" and the following answer choices: - gills - fungi - a fish - life - CO 2 - edible - sharks - tiny Now knowing that zooplankton are tiny animals that feed on phytoplankton and scientists have shown that ocean organisms known as zooplankton harbor cholera bacteria, choose the best answer.
tiny