Use the following word bank to complete the numbers 51-100. Acoelomate Arthropoda Alternation alveolus Book lungs cloaca cephalopoda chitin ditellim emulsification Conjugation companion filter feeding gametes lacteals Custaceans endotherm hemaphrodite closed circulation inferior vena cava Liver monotremes Operculum Pancreas Parazoa Protonephridium Plasmodium Phototrophs protein sino atrial node sporozoan pulmonary circuit Spinnerets shell spiral systole opposable thumb Stomata Kelps tracheids tracheal tube radial It.ventrides Radially trypanosomes monotremes dosed mycelium vessel elements rhizoids sieve tube elements This structure protects fish gills. This is the site in mammals where gases are exchanged with the environment This is the site of gas exchange in insects This vein collects blood from the lower body and carries it to the heart The common opening of the digestive system, the excretory system and the reproductive system is known as the Bile is produced in the Phloem, responsible for transporting nutrients in plants is composed of two types of cells and cells. These organs in spiders produce silk _In this kind of circulatory system blood is carried entirely in vessels: This organ is both and endocrine and exocrine gland This group includes platypus and spiny anteaters. Solution 51 - This structure protects fish gills OPERCULUM 52 - This is the site in mammals where gases are exchange with the environment LUNGS 53 - This is the site of gas exchange in insects TRACHEAL TUBE 54 - This vein collect blood from the lower body and carries it to the heart INFERIOR VENA CAVA 55 - The common opening of digestive system , excretory system and reproductive system is known as CLOACA 56 - Bile is produced in the LIVER 57 - Phloem , responsible for transporting nutrients in plants is composed of two types of cells SIEVE TUBE ELEMENTS AND COMPANION CELLS 59 - These organs in spiders produce silk SPINNERETS 60 - In these kind of circulatory system blood is carried entirely in vessels CLOSED CIRCULATORY SYSTEM 61 - This organ is both an endocrine and exocrine gland PANCREAS 62 - This group includes platypus and spiny anteaters MONOTREMES.