Which organ develops and is fully functional in the first trimester?
heart
brain
liver
lungs

The organ that becomes fully functional during the first trimester is the heart

Option A

Explanation:

The gametes which are formed by meiosis fuse with each other to form the zygote , the homozygous gametes join together to form the heterozygous zygote. This zygote which is a single cell undergoes mitotic division to form the blastula.

The cells at this stage are non-differentiated; these cells later differentiate into different organs and develop a full grown organism. The development of organs in a human body is sequential and thus among the above the heart develops in the first trimester.

my hamster died and my second hamster i got after that one died as well. i also lost two birds named rainbow and kiwi, (they didn't die, they flew off and escaped). i lost a cat named omi, and a dog named snoopie. the best way i got over it is, paying my respects, and just thinking that they were in a happy place. as well as just remembering but not thinking about it all the time, just do fun activities and try not to think about it too much. hope you feel better. i'm sorry about your loss. : (