What is the main function of veins in a leaf?

Photosynthesis

Transpiration

Transport of substances

Which of the following processes causes the release of nitrogen back in to the atmosphere

Polyploidy is an important mechanism of speciation in plants. true or false

In order for a population to survive, sexual reproduction must produce

An individual has type AB blood. His father has type A blood and his mother has type B blood. What is the individuals phenotype an example of? A. simple dominant heredity B. simple recessive heredity C. codominance D. incomplete dominanace

Which of the following human activities MOST negatively affects natural climate change? illegal fishing and hunting the burning of fossil fuels habitat clearing for construction introduction of nonnative species

During the cardiac cycle, the bicuspid valve closes: a. while the ventricle is in diastole b. when the ventricle is in systole c. while the atrium is contracting

What is a gene family? what mechanism generates them?

Calculate the percent increase in HFC emissions between the years 2005 and 2015. A) 10% B) 50% C) 100% D) 200%

Small adaptations allow species to occupy similar niches. O True O False

People who have hemophilia would probably be most concerned about