The PNS helps to maintain internal balance, or "homeostasis," by the Parasympathetic division of the Autonomic Nervous System (ANS). Sometimes referred to as the "rest and digest" system, the Parasympathetics keep our internal activities regular throughout the day and night, such as a steady heart rate, slow breathing, digestion of food, filtration of blood, and excretion of wastes.
Law of Superposition
a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it.
Answer:
P generation
Explanation:
The first two individuals that mate in a genetic cross is called the Parental generation or P generation. This is one of the terms used by Gregor Mendel, the father of modern genetics. P generation refers to the passing of genes or traits of the first set of parents crossed to the offspring. Their offspring are called the first filial generation or F1 Generation.
The vegetation of the tundra is composed of shrubs, grasses, mosses, lichens. Tree vegetation is very rare because of low temperature and short growing season.
Answer:
b is the correct answer of your question
