Helper T cells become activated by interacting with antigen presenting cells. and the second blank space is either cytotoxic t cells or B cells
Answer: C. Shadow length decreased from sunrise to noon.
Explanation: Think about how the sun is positioned in the sky. If it was noon, the sun is above the stick which means little to no shadow at all. If the sun was rising, its hitting one side of the stick, making the shadow longer.
A wildlife sanctuary is a place that is strictly controlled in order to protect a species from extinction.
The answer is c, people want to make a hybrid that is less likely to be diseased so that the plants wont die off
Answer:
Platismatia is a genus of lichens that often is found in forests. Lichens may be beneficial for forests because they provide food and nutrients for other species by fixing atmospheric nitrogen
Explanation:
The lichens are the result of mutualism between photosynthetic organisms (algae or cyanobacteria) and fungi species.
