Cell membranes are made of many things, however, for your question,
Phospholipids make up the largest portion.
Proteins span and line the membrane.
Cholesterol can be found in the phospholipid bilayer.
If this helps you, please vote me as brainliest!
Ecological systems often remain in balance if only one factor is altered.
Yes. Gymnosperms is less dense.
Real scientists do not 'use evidence to support' a theory.
Real scientists suggest a theory that can explain the evidence.
The 'big bang theory' can explain our observation that most galaxies
are moving away from us, and the farther from us a galaxy already is,
the faster it's moving away from us.
The correct options are as follows:
1. Human skin color variation is primarily determined by the type and amount of melanin pigment in the skin.
2. Human skin color variation likely evolved in response to differences in the intensity of sunlight around the world.
3. Human skin color evolve recently in hominid evolution, once some population of human ancestor migrated out of Africa.
The color of human skin is primarily determine by melanin. The intensity of the sun in the climate where one is living also affect the type of skin color that will dominate in a geographical area.
