Why is some cholesterol necessary for animal cell membranes but high cholesterol levels are dangerous?

This is an organism that breaks down and gains nutrients from dead organisms.

Each of the following phrases describes the structure, function, or regulation of either the hypothalamus, posterior pituitary, or anterior pituitary.

An amoeba is a single-celled organism that can usually only be seen with a microscope. A scientist measures an amoeba to be 0.10 mm long, and then a group of students measures the organism as well. Which student's measurement is the most accurate? 0.

If a white guinea pig is crossed with a black guinea pig what percent of the offspring will be white

A 6-year-old boy has marked edema of the legs, accumulation of fluid in the abdomen, and a low blood serum albumin and total serum protein. his urine contains large amounts of protein. what is the most likely cause of edema?

The ions in a compound form and orderly three-dimensional arrangement called a molecule. true or false

How would a scientist study the relationship between the Tiktaalik roseae and modern fish and tetrapods? create a diagram that hypothesizes ancestry use relative dating use transitional fossils to determine age review its analogous structures

In fruit flies, the gene for red eyes (r is dominant and the gene for sepia eyes (r is recessive. if a red-eyed heterozygous fly (rr mates with a sepia-eyed homozygous fly (rr, what are the possible genotypes of their offspring?

The largest mass extinction event in the history the Earth occurred at the end of the ___ period. A. Cambrian B. Ordovician C. Devonian D. Permian

Metamorphic rock transforms to sediment by