<span>Symptoms. The primary features of attention-deficit/hyperactivity disorder include inattention and hyperactive-impulsive behavior. ADHD symptoms start before age 12, and in some children, they're noticeable as early as 3 years of age. ADHD symptoms can be mild, moderate or severe, and they may continue into adulthood.</span>
Answer:
1.chemical receptors
2. nerves carry signal to the brain
3. nerves carry signals to the muscle
4. the brain process these signals
5. the shark changes direction and swims towards pray
Explanation:
Answer:
Pelagibacter ubique is often cited as the most common organism ever: it's a third of all the single-celled organisms in the ocean. But, as is always the case, something eats P. unique. In fact, four different viruses parasitize this one species.
Explanation:
Bacteria are monerans, the simplest single-celled organisms. They are the smallest of all cells, visible only through powerful microscopes. Bacteria are also the most abundant forms of life. ... Bacteria recycle nutrients in the soil and aid the human digestive system.
This sentence would most likely occur as the conclusion.
