What is the answer of these ??
If you don't know then leave it
Answers
B
1.Animals produce offspring through asexual and/or sexual reproduction. ... In an unstable or unpredictable environment asexually-reproducing species may be at a disadvantage because all the offspring are genetically identical and may not have thegenetic variation to survive in new or different conditions.
2.-------
3. Given in above attachment
4.The kidneys make two main hormones,vitamin D and erythropoietin. Vitamin D is essential for a number of different functions in the body. Most of the vitamin D that is in the blood is inactive and it is modified by the kidney and other tissues to activate it.(write this only if the points are given in ur book).
Answer:
Calcitonin is a hormone that is produced in humans by the parafollicular cells (commonly known as C-cells) of the thyroid gland' data-content='1456' >thyroid gland. Calcitonin is involved in helping to regulate levels of calcium and phosphate in the blood, opposing the action of parathyroid hormone.