Which of the following statements about homo erectus is false?
select one:
a. h. erectus was the first hominin to have a projecting nose with downward-pointing nostrils
b. some researchers believe that the h. erectus populations in east asia and africa should be classified as different species: h. erectus and h. ergaster
c. h. erectus had larger brow ridges than earlier hominins
d. from studies of its dental characteristics, h. erectus is thought to have been vegetarian

The false statement is option d.

Explanation:

The Homo erectus had exhibited some ape-like features, such as large teeth and heavy jaw. They used fire, and hunted and consumed cooked meat. On examining one came to know that the wear on the species teeth suggested a varied diet, which also comprised consumption of meat. It has been found that the female skeleton of H.erectus had shown some signs of hypervitaminosis, and the condition is most likely caused by the consumption of carnivore livers.

g1

choices:

a. g2. b. g1. c. m

cell division has two checkpoints namely, g1

checkpoint and spindle assembly checkpoint. the checkpoint which determines if

division has properly occurred is the g1 checkpoint. at this point, is a damage

in the dna is detected or  the has not reach the optimum size, the cell is

stopped in g1 and is not allowed to proceed to further process.

source:

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation: