Try your best to answer 60 describe the degree of cephilization shown by cnidarians, flatworms, octopi, and vertebrates. here is some information to you: animals that have bilateral symmetry often show cephalization. cephalization (sef-uh-lih-zay-shun) is the concentration of sensory neurons and interneurons into a "head." certain flatworms and roundworms have some cephalization. cephalopod mollusks, such as optopi and squid have more developed cephalization. so do many arthropods. in these animals, interneurons form ganglia throughout the body. the largest ganglia, called cerebral ganglia, are found in the head. : )

The degree of cephalization shown by Cnidarians, flatworms, octopi, and vertebrates;

Cnidarians have no cephalization (nerve net); flatworms have some cephalization (ganglia); Octopi and vertebrates have higher degrees of cephalization (ganglia and brain). Cephalization is an evolutionarytrend in which, over many generations, the mouth, sense organs, and nerve ganglia become concentrated at the front end of an animal, producing a head region.

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.  

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )