What is the inner layer of the earth

What is the chance of two parents with blood types ab and o producing an offspring with blood type o a.0% b.25% c.75% d.50%

The pressurized plants and fungi mentioned in the video have some surprising similarities. what differences would you expect them to have?

Look at the photo of the leaf, which term best describes this leaf ? a-simple.b-parallel.c-lobed.d-tooth.