Molluscs, insects and worms are all invertebrates.

软体动物 、 昆虫、蠕虫都是无脊椎动物.

This material protects the molluscs against their enemies.

这种材料保护着里面的软体动物不受侵害。

The molluscs were the first in biomass and density of the benthos.

全年各类群生物中，平均生物量及栖息密度都以软体动物居首位。

Diet: Feeds mainly on algae, molluscs and sponges among Acropora heads within sheltered reefs.

饮食: 饲料主要是藻类, 软体动物和海绵元首之间的鹿角珊瑚礁保护范围内.

Oysters metabolise oil poorly , and molluscs, being filter feeders run a high risk of exposure.

牡蛎很难分解石油, 作为滤食性动物的软体动物面临很大的风险.

If, indeed, it did belong to a different phylum, how did that group connect to the molluscs, annelids and arthropods?

如果它真的属于不同的门类，那么这个种群又如何连接软体动物、环节动物和节肢动物呢？

If, indeed, it did belong to a different phylum, how did that group connect to the molluscs , annelids and arthropods?

如果它真的属于不同的门类，那么这个种群又如何连接软体动物、环节动物和节肢动物呢？