Describe two ways in which an earthworm's body is adapted to life in the soil. 2. explain how an earthworm demonstrates cephalization. 3. although they are related, the digestive system of an earth worm and ascaris are very different. why do you think this is? 4. compare the reproductive system of the earthworm with that of ascaris. be sure to note both similarities and differences. 5. what are some ways that annelids are beneficial? 6. what features distinguish annelids from roundworms?

1)      Each segment of an earthworm has setae (bristly hairs), structures that enable the worm to have a grip as it burrows through the soil. The earthworm has longitudinal and circular muscles that enable it’s movements as it burrows in the soil.

2)      When an animal exhibits cephalization, it has a concentration of nerves ending in one pole of the body, that is considered the head. While earthworm ahs ganglions in each segment in its body, its largest ganglion is found at the anterior end (the ‘head’), hence shows some degree of cephalization.

3)      The earthworm eats up the soil and digests its organic matter while Ascaris lumbricoides, that is a parasite, absorbs nutrient through its body from the extracellular environment (host). Therefore an earthworm has a more developed digestive system than that of an Ascaris lumbricoides.

4)      Their digestive system has a mouth and an anus. However, that of the Ascaris lumbricoides is primitive compared to that of the earthworm. Actually, flatworms have no body cavity. This is why the Ascaris is considered to be a pseudocoelomate as opposed to the earthworm that is a coelomate (contains a true body cavity).

5)      Annelids recycle soil nutrients. By eating up the soil and digesting organic matter, they break it down to simple components that can e absorbed by the plants. As they burrow in the soil, they aerate it hence benefiting plants roots. These are important benefits in agriculture.

6)      Annelids have a complex organ system (true coelomates) compared to roundworms. Additionally, unlike roundworms, annelids have a  segmented body.   They also exhibit more cephalization than either nematodes (roundworms) or platyhelminths (flatworms).

"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."

starchy vegetables are high in carbohydrates.

starchy vegetables contain more carbohydrates than non-starchy vegetables.

explanation:

there are two primary categories of carbohydrates, essentially differentiated on the basis of their carbohydrate content (which is in the form of starch - a complex carbohydrate):

those vegetables which contain little amounts of starch are termed as non-starchy vegetables, and some examples include: artichokes, broccoli and bean sprouts.

vegetables high in their starch content are distinguished as starchy vegetables, and some examples include: potatoes, chickpeas and corn.