Fish has a singular circulatory system, means the blood carrying oxygen from pulmonary circuit will be dumped into the same chamber as the blood carrying wastes and CO2 in the heart, because the heart has only one chamber.
amphibians has a 3 chamber heart, but still not a complete separated pulmonary circulation. However, it does have 2 loops at this stage. Of course birds and mammal also has this feature. So the distinction will be between fish and amphibian, which is the evolutionary double loop pathway.
Karyotype is written in the form: No. of chromosomes, sex chromosomes
As, we know there are 46 chromosomes in humans & sex chromosomes may be XX for females & 'XY' for males so, we can write it as:
(46, XX) or (46, XY)
There could be some anomalies though. So, for more appropriate answer, you should put your options!
Hope this helps! Pm me in case of doubt! Happy Studying :)
I don’t really know the answer however
The answer is B. The Krebs Cycle releases lots of energy carrying DNA
Answer:
C: the presence of secondary xylem as wood tissue
Explanation:
C: the presence of secondary xylem as wood tissue, this help the tree get harder and stronger but not with population and the spread.