The heavier elements in the universe were formed by (apex)

Nuclear burning

Explanation:

Nucleosynthesis

Explanation:

The heavier elements in the universe were formed by the process of nucleosynthesis, in which lighter nuclei undergoes fusion in order to form a heavier nuclei. This process requires a high speed for collision, and is possible with extremely high temperature. The minimum amount of temperature that is needed for hydrogen fusion is about 5,000,000°C. It is believed that, the heavy elements, ranging from oxygen to iron are created in the stars that are comprised of nearly ten times as much of matter as it is present in the Sun.

In order to form elements heavier than iron and nickel, it requires significantly huge amount of energy. During a supernova explosion, the fuel supplies are exhausted in the cores of giant stars and it completely gets burn, forming heavier elements such as iron, lead, nickel, uranium.

Although sponges do not have organized tissue, they depend on specialized cells, such as choanocytes, porocytes, amoebocytes, and pinacocytes, for specialized functions within their bodies. The mesohyl acts as a type of endoskeleton, helping to maintain the tubular shape of sponges.

Explanation:

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