Will give the brainliest! you must be correct though. north atlantic right whales spend their winters off of the coast of the southeastern united states. in the spring, they migrate north to the coast of the northeastern united states. what is the most likely reason that these whales migrate to the north in the spring? a. conditions are more variable in the north during the spring. b. food is more plentiful in the northeastern regions during the spring. c. sunlight is more abundant in northern regions during spring. d. temperatures are warmer in northern regions during spring.

B. Food is more plentiful in the northeastern regions during the spring.  

North Atlantic right whales spend their winters off of the coast of the southeastern United States these whales finds coastal area suitable for mating purpose. The most likely reason that these whales migrate to the north in the spring because more food is available in the northeastern regions during spring season.  

the answer is d. chordata

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.