Approximately what percent of all the photosynthesis on earth is carried out by algae?

Organic debris that drifts down from the upper, lighted regions of the oceanic province, and is the base of food chains for organisms of the deep ocean is called:

if you cross 2 heterozygous parents what is the possibility the offspring will be heterozygous as well

Osh finds that there definitely is a relationship between enzyme action and temperature and graphs his results. The enzyme functions as a biological catalyst and has its optimum effectiveness at A) 30 degrees. B) 39 degrees. C) 59 degrees.

If you were to rub your finger over the surface of your face, you would notice that the skin is oily. what makes up the oil

Which of the following types of selection tends to maintain the diversity of alleles in a population with respect to a given gene, over many generations? Choose all the correct answers. A.) Disruptive sexual selection B.

He haploid generative cell of male angiosperm gametophytes divides to produce two haploid sperm cells. what type of cell division is this?

Selective cutting leaves forests that are just like old growth forests. true or false

Organic compunds are important to all living things true or false

The measures that have already been taken to control water pollution globally

The ability of a hormone to affect the activities of a particular cell depends on that cell having specific receptors with which the hormone molecules can bind. The number of receptors present in a target cell is a constant, invariable number.