Why did Antarctica's climate change approximately 50 million years ago?

Researchers at Boston University examined the brains of 85 individuals who had received repeated trauma to the head. How many of them showed evidence of CTE?

Which of the following describes an organ system? a group of atoms working together a group of cells working together a group of tissues working together a group of organs working together

Which statement about the size of the atom is true? a The size of an atom is smaller than the size of a sand particle on a beach. b The size of an atom is equal to the time in seconds since the formation of Earth.

What are five of the levels of the organization that biologist study?

Which selection is a characteristic or both living and non living things

Forest elephants in Africa have been confirmed as a different species from the larger savanna elephant seen here. Scientists believe the savanna elephant is as different from the forest elephant as Asian elephants are from woolly mammoths.

What competitive processes or forces are ever-present during a star's lifetime?

Which occurs during transcription? A. DNA is copied to create a second DNA strand. B. mRNA codons and tRNA anticodons assemble amino acids. C. DNA is unzipped with the aid of DNA polymerase. D. mRNA is synthesized from a strand of DNA.

In a beach ecosystem, what can limit growth of organisms? A. ocean and rocks B. oxygen C. abundant food source D. moderate temperatures

What process do the arrows for oxygen going in and water coming out represent in the Figure 9-2 diagram of the mitochondria?