Which statement best illustrates a biotic or an abiotic factor that is often found in a city park? a)decaying leaves are an abiotic factor because they are not living. b)rocks are an abiotic factor because they have never been alive. c)water in ponds is a biotic factor, because it provides a habitat for living things. d)oxygen is a biotic factor, because it is required for life and found in all living things.

B) Rocks are an abiotic factor because they have never been alive.

An abiotic factor is a non-living component of the ecosystem. The abiotic factor affects the living factors of the ecosystem. The abiotic factors includes sunlight, weather conditions, temperature, water, soil, minerals and other factors.

Rock is a non-living factor of the city park ecosystem. Therefore, statement rocks are an abiotic factor because they have never been alive best illustrates  a abiotic factor that is often found in a city park.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.