I think The amniotic sac forms, as well as the placenta. Major organs form and the heart begins to beat.
Hope help!
The correct answer would be D- lunar.
Option D is the only <span>source of energy that in not currently used to produce electricity in our homes. Researchers are creating lunar panels (similar to solar panels) but there are </span>obstacles to large-scale energy production.
The moon can generate electricity, but for now it's just not accessible.
The T lymphocytes capable of killing invading cellular organisms such as bacteria, protists, or fungi are cytotoxic T cells also known as CD8+ cells. These cells are capable of recognizing whether a cell has a major histocompatibility complex I (MHC I) surface protein or not. Those with absent MHC I surface protein will be killed by the cytotoxic T cells. Those with the MHC I surface protein expressing an invading antigen will also be killed by cytotoxic T cells. Those with the MHC I surface protein without an antigen will be spared by the cytotoxic T cell.
This would be called a D. Sinkhole. Sinkholes occur because groundwater washes and deteriorates at limestone under the surface. This leads to underground gaps. Once the pressure becomes high enough, the sinkhole collapse from gravity leaving a dent similar to potholes in the road.
