To prevent blood flowing back after each heartbeat. They ensure that the blood flows only in one direction (back to the heart).
The answer is sexual reproduction in which the creation of offspring by fertilization consisting 2 haploid gametes come together to form a diploid zygote with a new genetic combination. The main difference between sexual and asexual reproduction is that asexual reproduction results in a genetically identical offspring whereas sexual reproduction results in a unique offspring in which offspring with a new genetic combination.
Plankton they are the base for marine life
Answer:
from precipitation, oceans lakes streams and soil
