PLEASE HELP and explain The claim that a certain species of plants produce ammonia in their roots to counteract the negative effects of acidic soil would be supported by which of the following observations?T
he frequency in the population of individual plants that produce high levels of ammonia in their roots increases with soil acidity.
As the acidity of the soil increases, the number of individual plants able to survive and reproduce decreases.
When the plants are grown in soil with a neutral pH, the levels of ammonia in the roots of the plants remains stable over generations.
When plants that produce high levels of ammonia are crossed with plants that produce low levels, the offspring survive.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.