B cells produce antigen
t cell are helper,killer,memory cells
they hold memory of pathogens i the system
Answer:smooth and involuntary
Explanation:the sphincter papillae are muscles responsible for narrowing the pupil, while the dilator papillae makes the pupil larger. Both of them are smooth types of muscles, that are controlled by nerves, sending signals from the brain about the light conditions.
Answer:
A. It allows plants to use nitrogen to grow.
Explanation:
However, plants can't directly use nitrogen to grow. The bacteria need to convert atmospheric nitrogen ( N2 gas) into a form that plants can use.
Nitrogen fixation is a symbiotic relationship between plants and microorganisms of nitrogen fixers, which in the process of symbiosis perform the binding of nitrogen, which enters the earth from the air (atmosphere).
It is a reduction process of converting the gaseous form of nitrogen from the air into the ammonia form that is available to plants.
Neptune's gravitational factor relative to earth is 1.19.
That means we have to multiply 8.5 by 1.19.
8.5 * 1.19
10.115
Answer: 10.115 pounds
