A train accelerates at a rate of 2.5 km/hr/sec. During the acceleration period, its velocity changes by 55 km/hr. Choose the exact time of the train's acceleration.

A. 1,200 s

B. 22 hr

C. 22 s

D. 0.045 s

A plant biologist is asked to develop strawberry plants with larger, sweeter berries. Through selective breeding, the biologist successfully produces the new strawberry plant.

In a single strand of DNA, the phosphate group binds to the ___ of the next group

Which of the following is in the correct order from smallest to largest? A. tissue-organ-system-cell B. cell-organ-tissue-system C. System-tissue-cell-organ D. cell-tissue-organ-system

Which of the following would be considered a source of error in an experiment A) only three house flies were collected for an experiment B) A beaker is knocked over and the contents are spilled on the floor C) the data do not support the hypothesis

Which activity might a scientist do as part of the scientific process?

What is the function of myeloma cells used in the production of monoclonal antibodies?

Describe a simple nervous system. Give an example of an organism that has a simple nervous system.

An example of a parallel choice on a dichotomous key is

Describe one way the human respiratory system degrades over our lifespans, and explain one environmental condition that could cause an unnatural degradation as someone ages, including why that environmental condition harms their respiratory system.

Which is the mechanism by which improper excision of a prophage from a bacterial chromosome results in packaging of bacterial genes near the integration site into a phage head?