Leeches are soft, squishy animals with long, tube-like bodies that are made of many repeating segments. They contain a heart that pumps blood through their bodies and survive by attaching to other organisms and sucking their blood. What animal phylum do leeches belong in?

arthropods
echinoderms
chordates
annelids

The table below shows the number of foot bones in some horse fossils. horse fossil recordhorse fossil number of foot bonesp 19q 17r 24s 13ancient horses had more bones in their foot then present-day horses. the present-day horse has 11 foot bones. what is the correct order of evolution of the horse starting from the youngest fossil? a. q p r s b. s r p q c. s q p r d. r p q s

Which process in respiration happens first? a)pyruvate processing b)electron transport chain c)krebs cycle d)glycolysis

What are the pros and cons of transect sampling?