There are approx 100 billion
The female sex cells are called the egg and Male sex cells are called the sperm. Hop this helped.
<span>The correct answer is B.exocrine glands.
It is because exocrine glands do not belong to the neuroendocrine system.</span> <span>The neuroendocrine system integrates the interaction between the nervous system and the endocrine system to regulate the physiological processes of the human body (homeostasis, reproduction, metabolism, osmolarity, energy regulation, blood pressure). The major systems within neuroendocrinology systems are hypothalamic–pituitary–adrenal axis, hypothalamic–pituitary–thyroid axis,hypothalamic–pituitary–gonadal axis.</span>
Birds and butterflies don't have a common ancestor because one is a member of a insect and the other is well a bird. They both have different body structure. One has bones and the other has an exoskeleton. hope this helps
<span>a. they did not co-evolve with the natural species and lack natural controls, like predators</span>
