Which bacteria, Eubacteria or Archabacteria, has existed on earth for at least 3 billion years?

Why is primary far less common and takes much longer to complete than secondary succession

In this article the author explains what scientists are trying to find out. What are the scientists in the article trying to find out? Question 2 options: A. when sulfur first appeared in Earth's early atmosphere B.

In a phase, how do physicist define energy

Hans was locked in a large closet for the first four years of his life. A caretaker would bring him food and water and an occasional clean blanket. When Hans was rescued, how would his brain compare to that of a child raised in normal circumstances

The boundary between which two tectonic plates is most similar geologically to the plate boundary at the Mid-Atlantic Ridge? A) Pacific and Nazca B) Cocos and Caribbean C) Nazca and South America D) Eurasian and Indian-Austrailian

Most neurons in the brain are A) bipolar B) unipolar C) anaxonic. D) multipolar E) tripolar

How do symbiosis work with carrion Lilly how did it co evolve to be that way

At metaphase I, homologous chromosomes are connected only at what structures? chiasmata recombination nodules microtubules kinetochores

A red flower (RR) and a red flower (Rr) have the same: A. genotype B. haplotype C. Phenotype

The parents of a 2-year-old arrive at the hospital to visit their child. the child is in the play room and ignores the parents during the visit. the nurse tells the parents that this behavior in a 2-year-old child indicates which?