Reproductive System

Egg

Sperm + egg

The progestin in the progestin-only pill causes changes in the endometrium that prevent implantation.

The low dose of estradiol in the combination pill prevents the surge in LH production.

The low doses of progestin and estradiol in the combination pill have a negative feedback effect on the hypothalamus, blocking ovulation.

things to have looked at: the distributer-check the timing-replace spark plugs

the fuel filter may be clogged. the alternater may be going. also check the wires-cap-rotor

boys sleep longer because they sleep 9 hours to 11hrs and girls just sleep 7 hours to 9 hours

an ovum mature oocyte after meiosis division

the unfertilised (haploid) egg

His body.

One-half

(Source: The Developing Person: Through the Life Span, 7th ed. Kathleen Berger, pg. 79)

epithelium

Few environmental factors that can indeed affect the sperm production-

1. Industrial chemicals, such as benzenes, herbicides, pesticides, and certain painting material.

2. Heavy metals, especially lead.

3. Radiation or X-rays to the pelvic area.

4. Overheating, such as frequent use of saunas, hot tubs, and yes - computers in your lap. They overheat your testicles and decrease sperm production.

5. Prolonged bicycling. For all those guys who like to bike, watch out because this could be doing some damage to your sperm.

It doesn't affect in more concentration but still have to take care of.!

they lay eggs

If you mean average length of the penis in a 14-year-old, it would be shorter and less developed than in an adult male. The average length for adults is 5.57 inches erect. You will have to wait to see to see if yours will be that size as an adult. That said, 3 inches is more than large enough to have intercourse with an adult woman.

There are many factors like the genes, dna etc. Also the attitude and thinking changes from person to person.

To maintain your organs of sense reception, you need to ensure that you take a healthy diet and get enough exercise. You should also avoid areas or substances that may be harmful to the human body.

In simple terms, it's the middle number in a group of numbers.

There are three types of average - mean, median and mode. When most people talk about 'average' they mean the mean.

To get the mean, you add the numbers up, and then divide by the number of numbers.

e.g. the mean of 1, 3, 4, 4, 8

Add and you get 20

There are 5 numbers so 20 ÷ 5 = 4. So 4 is the mean or average

The median average is the number that is literally in the middle when the numbers are listed in order. For the set {1, 3, 4, 4, 8} the median is the third number which is 4.

If there is an even number of numbers, the median is the mean average of the middle two, eg for {1, 3, 4, 6, 7, 9} the median is the mean average of 4 and 6: (4 + 6) ÷ 2 = 5.

The mode average is the most frequent; for the set {1, 3, 4, 4, 8} is it 4 as the number "4" appears twice but all the other numbers only appear once. There can be more than one mode if more than one number appears the most often. If every number appears the same amount of times, there is no mode.

The mode is the only average which does not have to be numerical. For example in a survey of favourite coffee (eg Americano, Cappuccino, Latte, Macchiato, Mocha, etc) one type of coffee may appear more often than the others - this would be the mode.

No

Testosterone is what makes us more masculine.

The ovaries produce ova.

No, but you should learn how to spell before engaging in sexual activity

Yes

Yes ... although the amount of sperm may not be sufficient to fully fertilize the ovaries.

The answer to your question is puberty.

Three of the many organs in the female reproductive system include the uterus, ovaries, and vagina.

The acrosome is a structure that develops over the back half of a sperm. It contains proteins that are released when the sperm makes it to the egg & helps the sperm penetrate the egg. there is a good definition available in Wikipedia, for this, no need to rehash it here.