Answer:
According to me answer no 4 is correct.
Explanation:
single cell amoebas can perform all life functions capture the food, digestion, respiration, excretion, and reproduction also. These all are similar to multicellular animals.
The correct answer is option D
the pineal gland releases melatonin into the bloodstream
In the exocrine system the organ releases certain substance other than hormone while in the endocrine system , the organs releases hormones.
In option D, melatonin is a hormone released by pineal gland and thus it is an endocrine function
1. Rhythm generators (SA node)
2. Conductive cells (node cells)
3. Contractile cells (myocardial cells)
A waste product is a product that is made but isn’t necessarily needed eg. A lightbulb will make light energy but it also makes a waste product heat.
