Calculate the ph when 50. 0 ml of 0. 150 m koh is mixed with 20. 0 ml of 0. 300 m hbro (ka = 2. 5 × 10⁻⁹).

Nathan is an ecologist. he’s studying the effect of secondary consumers on primary consumers. his current research focuses on a population of blue jays and crows. they eat caterpillars and mice. if the number of blue jays increases, what are the likely effects on other populations? 1the number of crows will increase. 2the number of mice will decrease. 3the number of mice will remain the same. 4the number of caterpillars will decrease.

Jerrold has to buy 12 copies of a textbook which costs $36.25 per copy. how much must he spend for them?

Afish fossil is found in a rock. a foot bone and tooth are found in an older layer of the same rock. what can scientists learn from the rock? a) the area changed from land to water. b) the area changed from water to land. c) the area has always been land. d) the area was once an ocean.