During the 1900s, the following genetic discoveries were made: • DNA is the molecule responsible for inheritance.
• There are four bases in DNA, and they combine in a specific way. Adenine pairs with thymine, and guanine pairs with
cytosine.
• DNA is a double helix. The sugar molecules form the backbone, and the bases are connected by hydrogen bonds in the
middle.
• Enzymes that can cut and copy sections of DNA are identified and isolated.
As a result of these scientific discoveries, scientists are now able to

A.
determine some organisms' genetic sequences.
B.
change portions of genetic code to treat disease.
C.
clone certain organisms.
D.
all of these

Plz plz plz quick! 49 points for whoever which of the following statements about greenhouse effect is true? *life on earth is suffering because of greenhouse effect *the greenhouse effect is caused by human activity *all greenhouse gases are harmful *life on earth would not exist without the greenhouse effect

Natalie had random hand movements when she was two months old. when she was six months old, she used to grab a block with her whole hand. now at the age of ten months, she can grasp the same block with her thumb and forefinger. this sequence of growth in her hand and finger movements is according to the pattern.

Zoe decided to measure the hand length of each of her classmates. first she marked a line across each student's wrist and lined up a ruler from this mark to the top of the middle finger to measure the length. then she recorded the measurements in the table below. marla did this the same way for each classmate, and then zoe used this ruler to measure each straight line and record the data below. this data is invalid. what is the most likely reason why it is invalid? the ruler is marked in centimeters, but zoe recorded data in inches. the range of lengths is too wide, so zoe must have misread the ruler. marla’s complicated measuring procedure was overly confusing. marla could have been inconsistent while drawing outlines of fingers.