Which two molecules are the main structures in a cell membrane Sugars and ions
Carbohydrates and proteins
Phospholipids and DNA
Phospholipids and proteins

Phospholipids and proteins

Explanation:

The cell membrane is primarily composed of a phospholipid bilayer. The phospholipid molecules are made of a hydrophilic phosphate head and a hydrophobic fatty acid tail. These form a bilayer arrangement and act as a semi-permeable membrane.

There are also many proteins embedded in the phospholipid bilayer. These proteins act as channels, shuttles, transporters, enzymes, and signalling molecules to control the access of materials that cannot cross the bilayer and to respond to the extracellular environment.

"d.) carbon dioxide and hydrogen sulfide"

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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