The correct answer is: sea stars
All animals listed above are invertebrates. One of the characteristic of invertebrates are that they are protostomes with the exception of Echinodermata (sea stars). The difference between protostomes and deuterostomes is in their embryonic development (orgin of mouth and anus).
In protostomes the mouth forms first: the oral end of the animal develops from the first developmental opening. On the other hand in deuterostomes the first opening (the blastopore) becomes the anus, and the oral end of the develops from the second opening.
Humans are also deuterostomes.
1. Individual: any living being.
2. Population: same group of species that live in a paricular geographical area.
3. Community: a group of interdependent organisms of different species growing or living together in a specified habitat
4. Ecosystem: a community of living organisms called producers, consumers, and decomposers.
5. Biosphere: region of the surface, atmosphere, and hydropsphere of the earth occupied by living organisms.
Answer:
Hypoxia is believed to be caused primarily by excess nutrients delivered from the Mississippi River in combination with seasonal stratification of Gulf waters. ... Stratification of fresh and saline waters prevents oxygen replenishment by mixing of oxygen-rich surface water with oxygen-depleted bottom water.
Answer:
the ciliated epithelium tissue helps to collect the ovum why?
