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explain class oligochaeta - earthworms in detailsthis group of annelids includes the earthworms oligochaetes live in the soil or in fresh water
what is phylum annelida - segmented wormsmembers of this phylum are commonly known as the segmented worms the body of a segmented worm is made of
explain protostomes vs deuterostomes breiflybranching evolutionary lines it appears that the coelomate animals separated into two divergent lines of
explain coelomatesrecall that acoelomates have solid bodies and pseudocoelomates have body cavities that form between the endoderm and the mesoderm
what is phylum nematoda - roundwormsnematodes are commonly known as the roundworms they have a pseudocoelom type of body cavity and they have a
explain pseudocoelomates in classification animal kingdomin terms of body organization pseudocoelomates fall between the acoelomates and the
elaborates class trematoda and monogenea - flukesmembers of this class are commonly known as the tapeworms they resemble a long flat tape or ribbon
define class turbellaria - flatworms members of these two classes are known as the flukes flukes are parasitic flatworms that inhabit tropical areas
what is phylum platyhelminthes - flatworms this class consists of the free-living flatworms the best known of which is the genus planaria most of the
explain the acoelomates - animals without a body cavitythe simplest group of animals that has bilateral symmetry and a solid body acoelomate is the
what is coelom - body cavity explainamong the bilaterally symmetrical organisms animals have three different types of body plans with respect to body
what is bilateral symmetry systemto review all animals besides the sponges phylum porifera belong to the eumetazoa there are two groups within the
explain phylum cnidaria - coelenteratesmembers of the phylum cnidaria and one other group-phylum ctenophora the comb jellies-are the only two animal
explain radial symmetry in classification of the animal kingdomall of the animals besides the sponges are considered to belong to the eumetazoa or
what is phylum porifera in classification of the animal kingsponges are the simplest form of animals their bodies are not organized in any specific
what is lactationhigh levels of estrogens and progesterone during pregnancy stimulate the breasts to develop prior to lactation or milk production at
explain the birth in human biologyin humans birth of the infant occurs about 270 days after conceptionthe period during which the uterus contracts to
explain fetal developmentthe medical profession divides pregnancy into three-month stages called trimesters at the end of the first trimester the
what is embryogenesis explain in detailembryogenesis in humans consists of the first eight weeks of development of the zygote embryogenesis in
explain human developmenthuman development begins with fertilization and continues throughout life fertilization occurs when two sex cells a sperm
breifly describe the menstrual cycleeach month during a females reproductive years the hypothalamus secretes a hormone that stimulates the anterior
explain the female reproductive systemthe female reproductive system consists of the primary sex organs the ovaries and the accessory organs
what is oogenesis the female sex cells or eggs are formed in the ovaries the primary sex organs of the female the precursor of the egg cells or
describe the male reproductive systemin addition to the primary sex organs the testes there are accessory structures that store nourish and activate
what is spermatogenesis in human biologythe male sex cells or sperm are produced in the oval-shaped testes the primary sex organs of the male