Answer:
A a(birth rate+immigration)-(death rate)
The correct answer is social support.
Social support refers to the actuality and perception that one is cared for, has support accessible from other individuals, and most importantly, that one is a part of a supportive social network.
The four kinds of social support are:
1. Emotional: Expressions of love, empathy, caring, and trust.
2. Informational: Suggestions, advice, and information.
3. Instrumental: Tangle assistance and service.
4. Appraisal: Information, which is beneficial for self-assessment.
Answer:
atomic number or atomic mass
You need larger amounts of macrominerals. They include calcium, phosphorus, magnesium, sodium, potassium, chloride and sulfur. You only need small amounts of trace minerals.
Asexual organisms produce clones of themselves. That leaves the organism prone to being wiped out in its entirety, because every individual is equally in trouble when danger strikes. A virus or predator that affects one affects them all. It has no possibility of exploring new places, new foods, new methods of escape.
Souce: https://www.quora.com/Why-dont-all-organisms-reproduce-asexually
