question What is the name of the theoretical boundary around a black hole beyond which nothing can escape its gravitational pull

Science

What is the name of the theoretical boundary around a black hole beyond which nothing can escape its gravitational pull?

A. Event horizon
B. Schwarzschild radius
C. Hawking limit
D. Kerr singularity

The event horizon is the theoretical boundary around a black hole beyond which nothing can escape.

What is the function of the mucus-producing cells in the respiratory system?

A. Facilitating gas exchange
B. Trapping and removing particles
C. Producing antibodies
D. Controlling blood flow

In the periodic table, which period do the alkaline earth metals belong to?

A. Period 1
B. Period 2
C. Period 3
D. Period 4

Which planet is known as the "Red Planet"?

A. Venus
B. Mars
C. Jupiter
D. Mercury

Which famous comet, with a period of about 76 years, was last seen in 1986 and won't return until 2061?

A. Halley's Comet
B. Hale-Bopp
C. Encke's Comet
D. Ikeya-Seki

Which of the following is a transition metal?

A. Sodium
B. Iron
C. Chlorine
D. Aluminum

What is the purpose of the endoskeleton in vertebrates?

A. Support and protection
B. Nutrient absorption
C. Gas exchange
D. Muscle contraction

Which of the following is a halogen?

A. Sodium
B. Chlorine
C. Calcium
D. Potassium

What is the chemical symbol for sodium?

A. Na
B. Ne
C. Ni
D. Nb

What is the chemical symbol for potassium?

A. K
B. Ko
C. Pt
D. Po

In the human digestive system, where does the majority of nutrient absorption occur?

A. Stomach
B. Small Intestine
C. Large Intestine
D. Esophagus