John (whos line of sight is 6 ft above horizontal is trying to estimate the height of a tall oak tree. he first measures the angle of elevation from where he is standing as 35 degree > he walks 30 feets closer to the tree and find s that the angle of elevation has increased by 12 degree .estimate the height of the tree.

Explain why biological control methods are generally environmentally superior to chemical pest control methods.

Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.

Label all the places where dna is located in the plant cell and in the animal cell. dna