An atom with a mass number of 234 and an atomic number of 90 has?
a. 90 neutrons and 144 protons
b. 234 neutrons and 90 protons
c. 144 neutrons and 90 protons
d. 117 neutrons and 117 protons

Ascientist observes certain changes in the physical features of a particular species over time. she concludes that the species has undergone evolutionary change. she wants to study the animals by analyzing their population. she’ll use . the population of this species is decreasing considerably. if this trend doesn’t change, this species will fall under the category of animals. this is a plato question,i need to make up his biology credit.