The endosymbiotic theory to explain the origin of which structures?

a- mitochondria
b- ribosomes
c- nuclei
d- cell membranes

What is the importance of having the us forest service, the bureau of land management, the us fish and wildlife service, and the national park service? to manage land resources for conservation and the development of natural resources to manage land resources for conservation and the development of urban areas to preserve historical landmarks and manage the development of urban areas to preserve historical landmarks and manage the development of rural areas

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

Which of th following best describes how genes produce traits in an organism?