Your cardiovascular system is made up of the heart and blood vessels (arteries, capillaries, veins).
<span>They are both important. Latitude, the lines that parallel the equator are very important in determining plant growth rates and which plants can even exist because latitude is strongly related to average temperature. Altitude acts like latitude only over a shorter scale, so an increase in altitude of 1,000 ft may act like a latitude change of 3-4 degrees pole-ward. Longitude, that series of lines, perpendicular to the equator is also important, and is more related to water supply in the form of precipitation, so it would surely influence the kind of plants present - like desert plants versus rain forest types. Environments that are warm and with more rainfall generally will support more plant growth than those that are cold with little rainfall.</span>
Answer:
d. secondary endosymbiosis.
Explanation:
- When a living cell acquires another organism that eventually becomes a part of this cell, this process is known as primary endosymbiosis.
- When an organism that has already undergone primary endosymbiosis engulfs another eukaryotic organism then this process is known as secondary endosymbiosis.
- Secondary endosymbiosis has been known to occur in plastids because of which they are surrounded by two membranes. This bilayer is present because one of the layers is the original outer membrane of the organism and the other membrane is that of the organism that has been engulfed.
