The blood group B is almost absent in Native Americans, whose ancestors arrived in very small numbers about 10,000 years ago. Which factor is responsible for this phenomenon?

Which describes the behavior of members of a herd leaving an area to find food

What are the three main stages of the water cycle?

In a population of tomato plants, mean fruit weight is 60 g and narrow-sense heritability is 0.3. Predict the mean weight of the progeny if tomato plants whose fruit averaged 80 g were selected from the original population and interbred.

Scientists have found that the hedgehog signaling pathway is active in embryos during the early development of the neural tube, motor neuron specification, left-right symmetry, body plan, limbs, and retinas.

In the desert, saguaro cacti, owls, horned lizards, and fire ants all share the same space. Which example can be considered a population? a. all cacti in the same areab. the lizards and the antsc. all plants in the same aread.

Which of the following planets has the longest orbital period? a. Neptune c. Venus b. Jupiter d. Earth

What type macromolecule is used to make energy carbohydrates lipids proteins nucleic acids

A scientist at the polar ice cap was studying an ice sample from hundred of meters below the surface. While examining the ice, the scientist found some cells from many years ago.

An individual living entity is referred to as what A: Cell B: Organism C: Organ D: Tissue

In sexually reproducing organisms, why are there exactly two chromosomes in each homologous pair?