Connor listed the steps involved when a Portuguese man-of-war reproduces. I only have an hour on this test
1. Sperm and eggs are released into the water.
2. Eggs are fertilized.
3. Larvae develop and attach to a surface.
4. Larvae grow into polyps.
5. Each polyp forms tiny medusae.
Which describes the missing step?
The larvae break into pieces after step 3.
The polyps break into pieces after step 4.
The medusae bud off the polyp after step 5.
The polyps regenerate before step 5.

The missing step on Connor's list is the medusae bud off the polyp after step 5.

Explanation:

Portuguese man-of-war (Physalia physalis) is a cnidary -which is considered very poisonous to other species, including humans- and is not properly a jellyfish, but rather a set of different organisms (hydroids) grouped into a colonial organism. However, its life cycle is like that of jellyfish.

The life cycle of a  Portuguese man-of-war is:

In Connor's list, the missing step is the release of larvae from the polyp, after step 5.

Learn more:

Cnidarians link

"d.) carbon dioxide and hydrogen sulfide"