Which statement explains why oxygen molecules easily diffuse across a cell membrane while glucose molecules do not?
A. Glucose is too big to pass through.
B. Oxygen is a gas.
C. Oxygen is polar.
O D. Protein membranes block glucose.

What causes darkening of the skin as melanin production increases

When proteins are being produced by a cell, scientist say that the genes are question 2 options: activated turned off replicated deactivated

Match the following terms and definitions. 1. species that are adapted to live in equilibrium at carrying capacity population density 2. population growth that reaches equilibrium and carrying capacity population 3. death rate mortality 4. birth rate k-selected 5. a group of interacting individuals of the same species within the same geographic area natality 6. the number of organisms living in a particular area logistic growth