Sperm cells inside the pollen grain travel down the pollen tube and into the ovary which contains the ovules. Fertilization occurs when one of the sperm cells fuses with the egg inside of an ovule
C. The lungs can better exchange oxygen
<span>advancing mass of warm air, in particular, the leading edge of the warm sector of a low-pressure system.</span>
Once the Earth was full of water (ocean) after volcanic activities the mainland became land ( sorry about my english i am hungarian and i am still learning the language )
Plant trees because they absorbe co2
