Doubled chromosomes are held together by what

If 240 mL of water is added to 13 mL of 5.0 M NaCl solution, what is the concentration of the dilute solution?

Which population is most likely to be in Hardy-Weinberg equilibrium? A=a large population of ocean fish that lives in an unpolluted ecosystem that has abundant food B=

Which of the following statements about the causative agent of Rocky Mountain spotted fever is false? A) It is an intracellular parasite. B) It is transmitted by ticks. C) It is in the genus Rickettsia. D) It is gram-negative.

Which of the body's communication system operates the most quickly why

Which is a form of energy? a) heat b) coal c) petroleum d) gasoline

Which of the following describes the ways organisms are interconnected through their feeding patterns? Food chain Trophic level Food web Consumer chart

A tree is planted in a meadow. after 20 years it has grown into a big tree, weighing 250kg more than it was planted. where does the extra 250kg come from? explain your answer as fully and scientifically as you can.

Teeth begin to break down food by mechanical digestion. Which statement best describes this physical change?

The type of metamorphism that takes place in response to large-scale mountain-building process is called:

Differential survival and reproduction is best described by which term? a. natural selection b. creationism c. inheritance of acquired characteristics d. none of these