QUESTION:-
What is the maximum number of electrons that can be placed in the first shell/energy level?
A. 1
B. 8
C. 2
D. 18
Answer:
C. 2
The first shell, closest to the nucleus and with the lowest-energy electrons, is shell 1. This first shell has only one subshell (labeled 1s) and can hold a maximum of 2 electrons
The right option is; d. Immune system
The immune system is responsible for defending the body against harmful substances.
The immune system is the body’s defense system that protects the body against infectious pathogens and other invaders. The immune system is composed of many biological structures (special cells, proteins, tissues, and organs) and processes that functions together to protect the body. White blood cells are one of the important cells of the immune system that destroy harmful substances or disease-causing organisms that invade body systems.
Answer:
Changes in the environment affect the food sources available for birds. For example, if a flood was to occur, there would be an abundance of fish to birds to eat. So birds with bigger beaks will be able to eat fish, to live and reproduce offspring with bigger beaks. While birds with smaller beaks will not be able to catch fish to eat, therefore decreasing the population of birds with smaller beaks.
Answer:
Phototropism
Explanation:
I believe this is the answer, as the tips are lighter and going in one direction. None of the other descripctions apply.
Answer:
Gram-negative bacteria
Explanation:
Gram-negative bacteria are classified by the color they acquire after undergoing a chemical process called Gram stain. In this process, Gram-negative bacteria, which have a thinner polysaccharide wall (relative to gram-positive bacteria) that do not retain the violet crystal (used in gram staining) during the discoloration process and are red in color. final coloring process.
Gram-negative bacteria turn red when using this process. The other bacteria get blue in color. They are called Gram positive. Gram-negative and Gram-positive bacteria are different in color because their cell walls are different. They also cause different types of infections and different types of antibiotics are effective against them.
Gram-positive bacteria retain the violet crystal due to the presence of a thick layer of polysaccharides. Gram-negative bacteria have a thinner polysaccharide wall.
