Feeling pain, hunger, thirst, sleepiness, and being aware of our thoughts and emotions are all examples of Internal stimuli.
I think because they have a DNA
The following are the two conclusions that Morgan made about qualities and chromosomes:
1: Each chromosome is really a gathering of connected qualities.
2: Mendel's standard of autonomous combination still remains constant.
I hope the answer will help. Feel free to ask more questions in brainly.
A. Cerebrum.................
