Examlex
Which of the following is NOT a likely reason why diseases caused by opportunists are becoming more frequent in the U.S. population?
Flatworms
Invertebrates such as planarians and tapeworms with extremely thin bodies, a three-branched gastrovascular cavity, and a ladder type nervous system.
Earthworms
Segmented invertebrates that play a crucial role in aerating soil and breaking down organic matter.
Deuterostomes
A classification of animals characterized by the anus developing before the mouth during embryonic development, includes vertebrates and echinoderms.
Embryonic Development
The process by which an embryo forms and develops, from fertilization to birth in animals or to the seedling stage in plants.
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