What did virchow observe that led him to determine one of the main components of cell theroy

In prophase I of meiosis, crossing over results in A) genetic recombination. B) creating a male gamete. C) creating a female gamete. D) half the number of chromosomes.

Lakes, rivers, and streams are what kind of water

During a study that lasted several years, a researcher found that the number of breeding pairs of Florida scrub jays in the study area remained relatively constant. For approximately every 25 acres of land, there was only one breeding pair.

Which is the most likely reason that stem cell research is controversial?

Mutations that occur without a known cause are known as: a. spontaneous mutations b. induced mutations c. harmful mutations d. adaptive mutations e. reversion mutations

How have human activities affected the phosphorus cycle?

Many animals such as goats, deer, and cattle have horns or antlers. What purpose do these structures serve? Question 7 options: They are used for ornamentation and for attracting a mate.

Which of the following is not a characteristic shared by all chordates? fins hollow nerve chord pharyngeal pouches notochord

Alicia is not sure of the difference between a food web and a food chain. write a paragraph for alicia that explains the difference between a food web and food chain.

The distance north or south from the equator