It helps the plants create oxygen for us to breathe
3rd and 4th awnsers are correct
Answer:
three evolutionary lines
Explanation:
The Hox genes are master developmental genes found in animals, which are involved in the regulation of development by specifying the body plan of an embryo along the head-tail axis. Recently, several research groups studied the assortment of the Hox genes in three different marine organisms: 1- a priapulid worm (an unsegmented marine worm), 2- a brachiopod (phylum Brachiopoda), and 3- a polychaete worm (related to earthworms). Then, these research groups combined their research efforts to compare the assortment of the Hox genes observed in these species to those observed in previously studied animals including, among others, mice, fruit flies and sea urchins. From this combined study, researchers concluded that the animal kingdom can be divided into three primary evolutionary lineages.
Circulatory system related to respiratory system<span> in </span>crayfish<span>. both uses gills. in respiration walking legs and maxilla move water across gills. in circulation blood</span>
The Developing ovarian follicles primarily secrete hormone Estrogen.
Ovarian follicles are the basic units of female reproductive system. Estrogen, in females, are produced primarily by the ovaries, and during pregnancy, the placenta. Follicle-stimulating hormone stimulates the ovarian production of estrogens by the granulosa cells of the ovarian follicles and corpura lutea.