An anther contains 80 spore mother cells , what is the number of male nucleii in each of the 4 sacs which contain the pollen grains 80
40
60
160

Dna is colied into chromosomes in a cell

Some technological solutions to problems like global warming meet the specific needs and situations of local communities. an example from india involves converting the solid waste from cattle into clean-burning fuel for cooking. this reduces the amount of greenhouse gases, specifically methane and carbon dioxide, released into the environment from wood fires. when evaluating the feasibility of implementing this solution, computer models are used to weigh costs against benefits. what factor is least likely to impact the decision on adopting this technology?

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?