What happens during crossing over and what is the significance

A scientist studies the DNA in corresponding genes of a platypus, a beaver, and a duck. The DNA from which two species are most likely to be most similar? Explain your answer.

Trilobite fossils are found in Cambrian rocks but not found in the more recent rocks from Triassic period. This MOST likely suggests they went extinct before the Triassic. True or False

3) A primary objective of cell fractionation is to A) view the structure of cell membranes B) identify the enzymes outside the organelles.

Which term best describes an animal that eats meat that has just recently died? A. predator B. producer C. decomposer D. scavenger

All the offspring of a cross between a black-eyed mendelian and an orange-eyed mendelian have black eyes. what is the expected phenotypic ratio of a cross between two orange-eyed mendelian? a. 3 black-eyed:1 orange-eyed b.

A nurse is assessing a client with a diagnosis of primary open-angle glaucoma. which ocular symptom should the nurse expect the client to report?

The speed of neural impulses along an axon is increased greatly by

True or false: the northern lights are caused by earth magnetic field

Which of the following is a function of the nucleus? A) stores DNA B) stores sugars C) builds proteins D) packages proteins

Animals are motile because they have: a. energy b. metabolism c. nerve and muscle fibers d. legs or wings