Which statement describes the condition of the heart at the point indicated in the electrocardiogram? The atria are contracting and pushing blood into the bottom ventricles of the heart.
The ventricles are contracting and pushing blood out of the heart to the lungs and body.
The valves between the atria and ventricles close, producing the second heartbeat.
The valves of the aorta and pulmonary artery close, producing the second heartbeat.

I think it's B

Explanation:

During QRS that's when the depolarization happens and when that happens the ventricles contract and push blood to the lungs and body.  

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).