If natural selection operates to select for a specific trait, which statement must be true about that trait for evolution to occur?

Friends ... they are useless. Can someone tell me why every one wants them so bad?

The salinity of ocean water is due to high concentrations of:

A key component in the formation of organic compounds, such as nucleic acids and ATP A) carbon B) Nitrogen C) Phosphorus

The Punnett square for a non-freckled parent and a homozygous freckled parent is shown below. What is the probability that their children will have freckles? a 100% b 50% c 0% d 75% F F f Ff Ff f Ff Ff

Which of the following would not be a choice on a parallel key?

Which is the correct order of the processes responsible for the formation of sedimentary rocks? erosion, deposition, compaction weathering, cementation, deposition cementation, compaction, erosion?

Urine exits through what external opening on both male and female rats

What information can be inferred about genes that are located on different chromosomes? what information can be inferred about genes that are located on different chromosomes? these genes are always inherited together.

Bianca is very self-conscious about her weight. she indulges in strict dieting and often skips her meals. as a result, she was recently diagnosed with osteoporosis, an abnormal condition related to the thinning of bones.

All processes of moving materials across the plasma membrane are classified as either A) diffusion or osmosis B) passive or active transport C) phagocytosis or pinocytosis D) endocytosis or exocytosis