Explanation

Caffeine occurs naturally in the tea plant,

Camellia sinensis, so all brewed tea contains some caffeine. 

Tea leaves contain 3.5% caffeine,

while

Coffee beans have 1.1–2.2%.

Explanation

• A group of similar cells that perform a specific function combine to form tissue.
• Tissues then combine to form organs.
• Organs work together to form systems.

Explanation

Human blood is red because hemoglobin.

It is carried in the blood and functions to transport oxygen.

It is iron-rich and red in color.

Octopuses and horseshoe crabs have blue blood.

This is because the protein transporting oxygen in their blood, hemocyanin, is actually blue.

Explanation

Weight of the adult men brain $=49$ ounces
So, $49$ ounces
$=\frac{49}{16}$  pounds
$=3.0625$ pounds
Therefore, the weight in pounds is $3.0625$.

Explanation

Metacarpal bones are the five long bones found in the hand, connecting the wrist (carpal bones) to the fingers (phalanges).

They form the structure of the palm and provide support for finger movements.

Explanation

• The Golgi apparatus is a membrane-bound organelle that contains enzymes.
• It is responsible for processing and modifying proteins and lipids synthesized by the endoplasmic reticulum.
• It is a key component of the cellular machinery involved in protein secretion and cell signaling.

Explanation

• Rana tigrina, also known as the Asian giant toad or the Indian bullfrog.
• It is a species of frog found in Southeast Asia and the Indian subcontinent.

Explanation

The seat of memory and intelligence in the human brain is the cerebral cortex.

the cerebrum is the part that is designated as the seat of intelligence and voluntary action control. 

while

 cerebellum is part of your brain that helps coordinate and regulate a wide range of functions and processes in both your brain and body.

NA21-8-2023

Explanation

Scientists know that the core is metal because:

The density of Earth's surface layers is much less than the overall density of the planet, as calculated from the planet's rotation.

The interior must be denser than average if the surface layers are less dense.

Explanation