Which of the following is considered to be a living organism?
a. egg cell
b. human heart
c. grass
d. atmosphere

C. grass

Explanation:

A living organism can be define as an organism which is capable of responding to the external stimuli, growth, reproduction and development during it's life span.

Among the options given, grass is the correct option, this is because of the fact that grass describes to be a complete organism. But the egg cell, human heart are the parts of the living beings. The atmosphere is the part of earth which includes the mass of gases called as air. It is not a living organism.

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.