Question 9 (1 point) How do you explain that the moon sometimes becomes invisible to the observer?
The sun and moon are on the same side as Earth.
This is called a new moon
The moon is always invisible
The side of the moon lit by the sun cannot be seen.
Question 10 (1 point)
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cutt.ly/zxt1ipy

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

science-ocean floors and habitats study guide by volleyballqueen3817 a major advance in ocean-floor mapping. list four sections of the ocean floor. algae that use sunlight to produce their own food through photosynthesis. all of the feeding relationships that exist in a habitat. drying out, predators, find food.