The moon appears half lit, half dark from the surface of Earth on two days each month. What causes this? (1 point) Half of the moon's surface that is illuminated by the sun is visible from Earth's perspective.

Earth’s shadow is blocking the light from the sun.

Half of the moon is totally eclipsed.

It is a partial lunar eclipse.

An organ system consists of a group of organs that performs specific functions necessary for the survival of an organism. humans have eleven different organ systems: integumentary, skeletal, muscular, nervous, endocrine, circulatory, lymphatic, respiratory, digestive, urinary, and reproductive. discuss the function of neurons, the brain and the spinal cord within the human nervous system while explaining the interrelationship of each organ.

Apair of fruit flies reproduces and has 1,000 offspring. all 1,000 of the offspring have the alleles gg. what is the most likely combination of alleles for each parent

The distant ancestors of tigers may have had bodies without stripes. use the theory of natural selection to explain how tigers may have evolved to have stripes.