The reproductive adaptations to life on land were also extreme changes. ... Within the ring of petals are the reproductive organs, stamens, and carpels, the male" and "female flower parts respectively. ... The ovule then develops protective layers of sporophyte tissue around the embryo sac.Gonads that produce gametes and hormones and accessory glands that secrete products essential to sperm movement make up the internal reproductive organs . ... Each ejaculation of a human male contains upto millions of sperm cells, and males can ejaculate daily with little loss of fertilizing capacity. ... In...

• Word Count: 3790
• Approx Pages: 15
• Grade Level: High School

The reason that they rely so heavily on moisture in their environments is because they are lacking a vascular system. ... Bryophytes also play a very large role in the balances of many systems in the environment. ... Although the majority of bryophytes are not economically important for human consumption, peat moss is an exception. ... The main difference between ferns and higher plants is in their reproductive cycle. Ferns produce a very large quantity of spores, some of which land and grow into small plants, which possess both the male and female organs. ...

• Word Count: 1014
• Approx Pages: 4
• Has Bibliography
• Grade Level: Undergraduate

Classification of Living Things Classification is defined as identification, naming, and grouping of organisms into a formal system based on similarities such as internal and external anatomy, physiological functions, genetic makeup, or evolutionary history. ... Scientists compare the external shapes and sizes of organisms as well as the anatomy and function of internal organs and organ systems, such as the digestive or reproductive systems. ... Only a tiny percentage of plant species are directly used by humans for food, shelter, fiber, and drugs. ... Humans benefits from ...

• Word Count: 2632
• Approx Pages: 11