Which of these statements explains why the ratio of adenine to thymine is nearly 1: 1 a adenine bases contains a form of thymine b adenine and thymine are identical in chemical composition c adenine and thymine pair with each other d adenine binds with phosphates, while thymine binds with nitrates

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

Hydrilla (hydrilla verticillata) is an invasive aquatic plant and one of the most serious aquatic pests in florida. hydrilla has already been introduced to hundreds of bodies of water throughout florida, hydrilla is difficult to control because it grows rapidly and survives in many different water depths and conditions. hydrilla • describe how hydrilla affects native plant and animal species. include both a biotic and an abiotic limiting factor. • suggest one biotic and one abiotic recommendation that could slow the spread of hydrilla

Climate warming trends allow plant and insect species to inhabit larger ranges. select the best answer from the choices provided