Which of the following best describes the process of meiosis?

a.) it is the first stage of mitosis.
b.) it occurs in all tissues that require growth or replacement.
c.) it happens in all cells except in the brain and nervous system.
d.) it is carried out in cells that are involved in sexual reproduction.

An organ system consists of a group of organs that performs specific functions necessary for the survival of an organism. humans have eleven different organ systems: integumentary, skeletal, muscular, nervous, endocrine, circulatory, lymphatic, respiratory, digestive, urinary, and reproductive. discuss the function of neurons, the brain and the spinal cord within the human nervous system while explaining the interrelationship of each organ.

Choose one animal (cheetas) and research on the internet what has contributed to this animal becoming "endangered" or "threatened." what animal you have chosen? how long has the animal been endangered or threatened? what has contributed to this animal’s endangered or threatened status? why is it important to save this animal from extinction? after researching and gathering facts, write a 350-word letter from the point of view of an animal rights' activist. be sure to include at least five facts that you learned from your research.

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?