The small white insects (cochineal) that live on the beaver tail cactus in the arroyo seco suck sap and water from the cactus without providing anything for the cactus in return. this is an example of

Which organisms have pharyngeal arches that develop from all three germ layers and go through the same development stages as embryos? 1.bird 2.ladybug 3.starfish 4.snake

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

Consider the classification levels of a human. eukarya ,animalia ,chordata ,mammalia ,primates, hominidae ,homo ,sapiens .which is the most specific taxonomic level in the classification system above? a sapiens b homo c hominidae d primates