An oak tree provides food for many animals. The oak tree is found at which level of the energy pyramid? A) 2
B) 4
C) 1
D) 3

*will mark brainliest* which of the following best describes a viral infection, such as the common cold? a. virus grow and develop in the body. b. virus are living organisms. c. viruses require host cells in the body. d. viruses can be treated with antibiotics.

How does the study of genetic disorders such as pku biologists understand normal alleles?

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.