Humans have 23 pairs of chromosome in every body cell. Even one extra chromosome causes death or serious disorders. For example, an extra copy of chromosome 21 causes Down syndrome.
Which of the following are affected in a human being with an extra chromosome? Choose the three items that apply.
a
b
genotype
phenotype
genetic instructions
acquired traits
C С
Od

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat

Why does it matter if osmosis is put into a “scab” or a “nosebleed? ” where would that leave him?

Which of the following situations describes a adaptation for a mole? question 2 options: a mole is blind and cannot see underground. a mole is bright and attracts the attention of predator birds. a mole has a sensitive sense of smell to it find food underground.