D because they are complete systems
Answer:
ATP
Explanation:
ATP is an energy storing molecule which can help with active processes like active transport. It stands for Adenosine triphosphate
Answer:
3 Pollen tube forms and grows through the style
5 Sperm fertilizes the egg
1 Pollen is released from the anther
4 The pollen tube reaches the ovule within the ovary
2 Pollen sticks to the stigma
Explanation:
The process of double fertilization entails the fertilization of the egg by one sperm and that of two polar nuclei to produce the triploid endosperm tissue that nourishes embryo.
* The image describes the process in detail.
Chromosomes are made up of two sister chromatids , and are then dispersed as chromatin which is the DNA making up the chromosome.