Andre is a seven year old boy from scraped his knee after falling while riding his scooter. system will play a role in protecting his health after this fall. everely, and his lymphatic

1. How do helper T cells play a role in helping protect Andre from any pathogens that may have entered his body through his open
wound?

2. The inflammatory process will bring neutrophils to the wound site. What function will they serve?

3. As Andre ages, how will his immune system change?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

The ozone molecule o3 has a permanent dipole moment of 1.8×10−30 cm. although the molecule is very slightly bent-which is why it has a dipole moment-it can be modeled as a uniform rod of length 2.5×10−10 m with the dipole moment perpendicular to the axis of the rod. suppose an ozone molecule is in a 8000 n/c uniform electric field. in equilibrium, the dipole moment is aligned with the electric field. but if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion.what is the frequency f of oscillation?