What is the longest age of life on Earth at over 4 billion years? A. Cambrian
B. Precambrian
C. Paleozoic
D. none of the above

Ecosystems involve living organisms interacting with non-living things in a productive way; how is photosynthesis an example of this? answer, i will give brainiest to first person to get it right.

Environmental differences within ecosystems are generally caused by

Sperm pass through the and connect to a short ejaculatory duct. vas deferens prostrates seminiferous tubules none of the above