El átomo de un elemento tiene 15 electrones y 13 neutrones ¿cuántos protones tiene en el núcleo?​

juan

Explanation:

juan

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

regents of the university of california v. bakke, 438 u.s. 265 (1978), was a landmark decision by the supreme court of the united states. it upheld affirmative action, allowing race to be one of several factors in college admission policy.