What event marked the end of the mesozoic era and the beginning of the cenozoic era

(apex answer) - an asteroid impact

Darwin's theory predicts that variations can eventually produce a new species. Yet, scientists have never actually seen one living species give rise to another. Explain why not.

Scientists often perform repeated investigations. What is the main reason for this.

The recovery and identification of plant remains from archaeological contexts to study past human use of plants is known as

Which of these fields of science is the study of the atmosphere, including climate and weather?

In a population, a shift in the average population phenotype toward the mean and away from the physical extremes. This process lowers phenotypic variety; the population is more homogeneous.

in your own words, explain what a mitochondria is. the funnier, the better. also, answers in the comments are welcome as well.

How does the pulmonary vein differ from the other veins in the body?

Where do you think trees get there nutrients they need to grow

Which characteristic is true of organic fertilizers? balanced caustic slow acting soluble

Tetralogy of fallot is a congenital condition of the heart that manifests in four distinct anomalies of the infant heart.