1. Both Kayla and Eli are gifted athletes, extremely intelligent, and unusually attractive Discuss some of the reasons why they might share these characteristics.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

a) carbon, hydrogen

b) carbon, hydrogen, oxygen, nitrogen

c) carbon, hydrogen, oxygen, nitrogen, phosphorus

d) sugar

e) amino acid

f) nucleotide