Which statement accurately summarizes the Alvarez asteroid impact theory of dinosaur extinction?

(1)An asteroid struck Earth, altering the environmental conditions and leading to the extinction of many species, including dinosaurs.

(2)Changes in global temperatures imposed stress on the dinosaurs and they could not adapt fast enough to survive and reproduce.

(3)All dinosaurs lived in an isolated area. An asteroid struck this area, killing many dinosaurs. There were not enough survivors to maintain the species over time.

(4)Dinosaurs that ate plants competed for food with too many other organisms. Due to their size, they could not find enough food to survive.

Complete the sentences by matching the names of trees to the appropriate blanks. to do this, drag the names on the left into the appropriate blanks in the sentences on the right. match the words in the left column to the appropriate blanks in the sentences on the right. terms may be used more than once. make certain you have filled every blank with a term before clicking submit. 1. deciduous trees lose their leaves seasonally and include trees such as maple and elm. 2. conifer leaves are generally thin and needle-like, while seeds are contained in cones. conifers include cedar and pine. 3. evergreens are plants that maintain their leaves in all seasons and include trees such as cedar, elm, and pine. 4. hardwoods reproduce using flowers and have broad leaves; hardwoods include trees such as maple, , and cedar. elm returned you filled in 2 of 10 blanks incorrectly. mango trees are tropical broad leaf plants that maintain their leaves all year long. no credit lost. try again.

Which statement about the immune system is false? a. lymphocytes reduce inflammation, b. b cells remember specific pathogens. c. most white blood cells kill bacteria d. white blood cells are made in lymph nodes.

Which of the following was a characteristic of a dromaeosaur? modified front claw grasping with their forelimbs both a and b none of the above