Scientific theories, such as the theory of evolution, must be

A - neither testable nor observable

B - testable and observable

C - observable

D - testable

Why did early investigators predict that there must be a reduction division in the sexual reproduction process?

It appears that "hidden genetic variation" is responsible forallowing selection to move the average value of a traitbeyond the range of values that the trait displayed in theinitial population.

If photosynthesis produces cellular energy (atp) from sunlight, why do plant cells also need to perform cellular respiration, a process that produces atp from sugar

What is located in the lateral horn of the spinal cord gray matter?

All of the following are functions of the peripheral nervous system except it interprets signals from the external environment it sends signals to the internal organs it receives messages from the central nervous system it sends messages directly to

Which traits does DNA contain code for? inherited traits dominant traits recessive traits or personality traits

In fishes, pharyngeal pouches may develop into

What are the genotype so of a homozygous tall (tt) and a heterozygous tall (tt) ?

How many years would it take the Atlantic Ocean to grow 500 centimeters

Why are phytoplankton essential to aquatic life zone?