Answer:
13
Explanation:
The atomic number for Aluminum (Al) is 13. If you have access to the periodic table, this would've taken a few seconds.
the key element in the ecological concept of species is that individuals within a species can successfully interbreed and conceive healthy offspring
2,200 species, and recovery plans were approved or implemented for invasive species.
A hypothesis is an idea or explanation that you then test through study and experimentation. A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. . Most hypotheses can be supported or refuted by experimentation or continued observation. Theory: A theory is more like a scientific law than a hypothesis. I hope this helps! Please give me stars to tell me how well I'm doing.
The outer periphery of the inter-vertebral disk is composed of strong fibrous tissue called the Annulus fibrosus. This is a tough circular exterior of the inter-vertebral disc that surrounds the soft inner core, the nucleus pulposus. The outer portion is composed of a ring of ligament fibers that encases the inner core of the disc and securely connects the spinal vertebrae above and below the disc.
