Differentiate between gametangial contact and gametangial copulation.

Explanation

To differentiate between gametangial contact and gametangial copulation, we can follow these steps:

### Step 1: Define Gametangial Contact
Gametangial contact is a form of sexual reproduction where only the male nuclei enter the female gametangium. This occurs through the development of a pore and a tube that connects the two gametangia.

### Step 2: Define Gametangial Copulation
Gametangial copulation, on the other hand, involves the entire male protoplasm entering the female gametangium. This process is more comprehensive as it allows for the transfer of more cellular material.

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