Describe how physical and chemical changes are different. how are they similar?

How are gene and protein sequences used to classify organisms?

Which of these is a major trend in land plant evolution? a) the trend toward smaller size b) the trend toward a gametophyte-dominated life cycle c) the trend toward a sporophyte-dominated life cycle d) the trend toward larger gametophytes

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.