Which statements describe dark matter? Select two options.

A:It is invisible.

B:It is the same as dark energy.

C:It is well understood by scientists.

D:It does not emit electromagnetic radiation.

E:It can be observed by shifts in red and blue light

Calculate the enthalpy change, ΔH, for the process in which 14.5g of water is converted from liquid at 10.5∘C to vapor at 25.0∘C. For water, ΔHvap = 44.0kJ/mol at 25.0∘C and Cs = 4.18 J / (g⋅∘C) for H2O (l).

What words best describe the structure of phospholipids in the cell membrane? A. loosely-held in layers that vary greatly from cell to cell B. dynamic and loosely-held in two layers C. loosely-held in one layer D. fixed tightly in two layers E.

A month after his return from Afganistan, Tony had disturbing memories of his combat experience as a soldier. He continues to have nightmares, flashbacks and is bothered by bright lights and loud noises.

Explain how competition limits a population's growth.

Components of the cell membrane constantly shift the

The discovery of supermassive black holes began with the discovery of - tiny black holes. - the Milky Way. -adio energy from space. -the Big Dipper.

Which of the following is most likely to improve the fitness of a population to its environment? a. genetic drift b. mutation c. natural selection d. gene flow e none of the above will improve fitness.

Why is it important for biologists to include scientific names when reporting their research to other biologists around the world?

White blood cells produce what substances that destroy pathogens in the body

Which of the following events occurred about 1.2 billion years ago and resulted in an increased rate of evolution for Earth's life forms?