Possible variations of a gene that controls a specific trait A) Heredity

B) Phenotype

C) Gene

D) Allele

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

The eruption of a nearby volcano causes a prairie ecosystem to receive a lot less sunlight.which of these is the most likely effect on the ecosystem? a-an increase in biodiversity. b-an increase in immigration to the area. c-a decrease in available water. d-a decrease in plant growth.

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen